You won't need any roll input for a V1 cut. The FBW will effectively keep the wings level (in simple terms). And as for using the sidestick, if your overcontrolling - it's your fault! The thing is so artificially stable you hardly need to touch the side stick.
When I went for a 320 assessment, someone gave me the advice "Treat it like your mate's dick. If you have to touch it, touch it as little as possible!" When you find the aircraft oscillating - which it inevitably will, just let go for a while.