This is gonna sound weird...but can as many people who are willing take a laptop that bothers them and lay on your side on a bed etc with the laptop on it's side as well and report back on your strain? Maybe try some other weird and new positions?
It may very well be another one of those placebo things but I have noticed in "non-standard" positions or moving around to new locations, my primary symptoms of neck/back of head/upper back tingling/tightness (which leads to ocular and back of head headaches if I push through) is less. Sitting at the desk I am usually sitting at all day (disabled and at home all the time) equals instant strain anymore.
I am not insinuating this is the case for everyone, but I am suspicious that in my case there might be a strong psychosomatic/postural factor. My symptoms have increased dramatically over a few weeks as intense pressure in my life is happening. I went to eye doctors for second opinions leaving depressed with no answers, spent a ton of money I cannot afford to spend, and am just feeling so intensely stressed. I found myself the last days getting symptoms with the old "safe" CCFL laptop, non-lit E-ink devices, and bizarrely even when not in front of any screen! I woke....went out of the house....had the same strain feelings whilst in a car and shopping without having looked at an LED display! None of those things were ever once a problem for me even 2 weeks ago, the CCFL and E-Reader were always pleasant, I've not changed anything in their software, and it's hard to believe I am suddenly "strained" in all these situations.
I have experienced psychosomatic back and neuropathic pain before and know it is a very real thing (look up John Sarno) People get insulted imagining that as a cause for any suffering and I did as well, but some things I suffered terribly went away and had no clear cause and from time to time (once a year or less on avg I'd say) pop up again in times of severe stress but go right away when I think "there isn't anything wrong I didn't hurt myself" etc. The mind can use the same nerve and process pathways as disease to cause pain and misery and can be very tricky about how and when it does it. If I hadn't experienced this first hand I'd probably call bullshit on the suggestion that the pains I had could possibly not be caused by actual damage or disease. On one hand I'd love it to be this as that means all LED tech isn't "bad" and it's hopeless...but it's also not a simple thing to deal with on it's own. I am just at a loss since nothing helps and now even "safe" things like an E-ink display is suddenly triggering me. That seems fishy.