Has anyone tried a lower accuracy on t9 then the recommended 495?

I did about 2.5 hours @489 staying mainly on the side of darnus/golems as much as possible and only recorded 2 auto attack misses. Will try a accuracy slightly higher tonight hopefully but I doubt we need to go as high as 495. Depending on the exact value it could change our BiS, there is a large difference in gear between 493BiS and 495BiS.

Also slightly related for anyone with more t9 experience, is it advisable to go with the front accuracy of 515 due to the last phase positioning or is it easy enough to stay on flank/rear?