I usally keep my ac 8-13, I assume semi means a little blatant? but not too much? just use 3.1-3.3 while sprinting and misplace. I wouldn't go below 90 with velocity. Aim is undetectable so go for max.
If you like your account, I recommend playing the blitz tournament either legit or with extremely closet settings (similar to what you'd use in RSW). The staff team actually check replays for t500.