Dervy,
I can say that I have put in thirty plus some hours of T8 with only in the rear of the target for ID and Brain Jack. I will ask a friend for some old records, but pretty sure I stopped missing once I hit 490. 80% of the fight, I am in flank position.
T9, I saw a miss or two, until I started to raise Accuracy. Have not seen a miss since hitting 495. But can reduce down and test this up coming week if you need more input.