Finally bit the bullet and got my helios 500. Was able to stop all throttling and I love it. Minimal backlight bleed. Tiny bit in bottom left corner. Feel like I got lucky.
But how in the world do I turn off this Acer TrueHarmony?! I've Googled it a ton and there is very little info. But everything sounds so weird. Almost like it's inside of a stage theater. I see that there are selectable presets in Predator Sense, but no way to turn it off. Clicking on properties in the sound control panel does not bring up the options that some have posted online.