You know the throttle has many different positions, not just fully open.
I've been in Rich's Eddie and felt that it could handle more power. My old car had 221 and 365lb ft and again that felt fine... albeit it an LSD would maybe help for a serious track day slag. But these Mk5 chassis are quite good for a FWD, you don't get the torque steer and huge understeer that an Astra for example gets.