here's a comparison of fit an toque costs
225/45 & 255/40 vs 245/45 & 275/40 on you existing wheels(btw ET for the fronts is +17.7), the 225/255 cobo gains you ~ 16.1 lb/ft and should be plenty of tire for up to ` 330 HP
245/45 & 27540 vs 245/40 & 275/35, there the /40 & /35 gains ~22.3 Hp over the /45 & /40
The Sumis were randomly chosen because they have the pertinent sizes, other tires in those sizes will be give similar results as a small difference in wt only imparts a small difference in torque cost., By far the distance of the weight from the axis is the more critical factor