Basically if you start to get a roll PIO on final, let go for a couple seconds. Also until you get very used to the feel, try to correct in a single axis at a time. As in, let go until the thing stops wallowing, then make a small fingertip correction to pitch only IF REQUIRED, and the a SEPERATE small fingertip correction in roll only. Remember to center the stick between all corrections, and let it "live" in the center.
While the 330 is supposedly programmed to have similar roll rate responses to the 320, it is a big, heavy airplane. It does not require as active a hand on the stick, as it has a lot of momentum and will resolve most small disturbances on its own. Let it do its own thing in turbulence, giving it "guiding" corrections to PATH deviations while allowing it to settle most minor attitude disturbances on its own. In normal law, let the airplane do the grunt work for you. If your approaches all end up requiring lots of corrections down low, you are over controlling from earlier on than you think you are.
Again if all else fails just let go completely, take one deep breath, exhale, and put your fingertips back on the side stick and correct one axis is at a time, always coming back to center.
And no the real airplane is not as squirrelly as most 330 sims seem to be!