AGI I had issues with a fresh Paranoid install after wiping Pie (OOS 9). No problem flashing it through TWRP, but modem was not working. Tried a lot including originsk OOS for OP3 but nothing was working. Finally fix for me was clean flash OOS 8, booted and checked everything was working, then clean flashed Paranoid. Now everything is working again.
Installing Paranoid Android on OnePlus 3
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degen Finally fix for me was clean flash OOS 8,
Oh, I see...so you did not have to install an OxygenOS version based on Android 7.0, like 4.0.3...you started from Oreo.
Mmmm, that is what I did...
The phone came with OP3_O2_open_25 (no idea what it is) but it said Android 8.0.
After the failed install of PA, I flashed OxygenOS 5.0.8, but did not try to reinstall PA since.
You tried both Oreo and Pie. How did the eyestrain go? Differences between the two? Thanks!
@KM @degen What is the battery lifetime? I look at the phone stats and found a miserable 3 hours and something :-(
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AGI Both Orea and Pie gave me equally bad eyestrain. It's obvious in the display too the rendering is different in Paranoid.
I must have flashed like 15 different roms trying to get it to work after that. Firmware only roms for the modem, everything. For a while I couldn't even access recovery. Lol. But this thing is pretty resilient so I say experiment away.
4 months later
Did you ever hear back? I got the display working finally, had to disable hardware overlays - it seems there's multiple versions of PA7.3.1 for the OnePlus3(T) floating around, mine is the one available from the PA site but I think that's not up to date - the official site linked from their XDA threads (http://get.aospa.co/official/oneplus3) is curiously unavailable.
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Gurm I got pa_oneplus3-7.3.1-RELEASE-20171030-signed.zip with md5sum 9575bfd76cf662fc348ce45e0dd451c4 and sha1sum 9c4246b144db4d8c760f4968014306786a18a0e9
I believe the last known-good OxygenOS version was this, as I still have it in my downloads: OnePlus3Oxygen_16_OTA_041_all_1702081756_f9fb218af59d4aa6.zip
I don't think it has auto-update. Just long press and hide the update notification.
Gurm IIRC OxygenOS was good until their Android 7.1 release. So 7.0, which should be that file, was still good. Provided I didn't look at PWM nor use color-altering brightness apps. Only browser I know is safe for me is Chrome. Maybe that file will also overwrite your firmware and modem so you'd have a clean setup, but I'm not sure about that.
Pulling 7.0 as well as the last 6.x release, keeping fingers crossed that I can just blast one of these on and be like "oh so nice". Maybe I can downgrade to an older PA in that case, since it seems like a much-improved ROM, but even stock Oxygen is better than what I've been using.
4 days later
Well, at least on my OnePlus, the screen is just a non-starter. I tried PA7 (graphics glitches, sadly, and not perfect even without the glitches) and the "last known good 7.0 build". I am tempted to downgrade it to Marshmallow and see where that gets me, but honestly the display is no good for my eyes no matter what. I'm putting it back to stock and selling. 
Oh, yes please. I think PM's on here are busted, I've never successfully sent or received one. 
I'm happy to share my email with any of you guys, TBH.
Gurm PM can be done now via Chat at https://ledstrain.zulipchat.com/
2 months later
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I recently went on a binge installing all kinds of roms including LineageOS 17 which has Android 10 base. All of them are no good on my OnePlus 3 and cause the problem eyestrain.
One thing to consider is that for a fresh start with this phone, you can always download MsmDownloadTool from xdadevelopers to bring OP3 to Android 7.0 eyestrain-free version. This tool completely resets your phone to factory (including relocking the bootloader) if you messed it up in any way and is probably a good way for a clean start to move on from. Then installing Paranoid Android on that is really optional.
Secondly, Paranoid Android will install but modem will not work, unless Oxygen OS 5 (Android 8) has been flashed just previously and then wiped. Have no clue why this is. I can download modem + firmware files for the OP3 based on OOS 4 (Android 7), flash it, and then Flash PA and the modem won't work, which makes no sense at all.
If anyone wants to try that procedure I can give you the file names and checksums and what not.
Personally I want to try the OnePlus 3T as it has a bigger battery and is sightly newer so used units on the market should have a fresher battery.
For me the OnePlus 3 relaxing experience isn't something that takes a long time to see. If you don't notice the difference switching to Android 7.0 or Paranoid 7.1.2 within.. almost immediately.. then I don't think it will work for you.
Actually, I would encourage anyone to download MsmDownloadTool, get it back to 7.0 automatically with this magic tool, then it will already be in a good firmware state as regarding eyestrain. If that's good, then go to the effort of trying Paranoid Android. There is no magic to Paranoid Android except the developer left out something and allowed us to get a slightly higher version without introducing the mysterious eye strain inducing change.
Not that Paranoid Android 7.1.2 is secure or anything, for sure it's getting long in the tooth, but this is discussed earlier in the thread.