Based on my observations of LED and CFL bulbs it seems Philips LED bulbs always have flicker and buzzing when hooked up to a dimmer switch no matter what settings. I was at a friends house with CFL and LED lights and there was "implied" dimming circuits in the walls which caused them to flickery VERY terribly (Thinking about that gives me a headache 😐)
I think the best solution is waiting for DC based LED's with good spectrum and flicker free drivers, and/or sticking with incandescent bulbs until this improves.