I've tested this over the last week or so. I dropped my accuracy to around 95.4% or so, and swapped enhancements to power/surge and am sitting at 35% crit, 79.8% surge and I think 966 bonus damage (hazy this is from memory). Sitting at around 1980 cunning buffed (no datacrons as I am lazy) I absolutely do more damage in every wz now, and if Im going to focus a tank I use illegal mods anyways. Anything over 95% is just a waste for pvp. I ran 100% accuracy forever thinking the same thing, but its just not true.
Any sniper/gunslinger that wants to 1v1, you at your 100%+ accuracy and me at my 95%, I will win. Feel free to look me up if you are on the Harbinger.
Superfabulous