The Tuffheads (GREAT heads BTW) are either 225 or 300 gr. The heavy head will move your balance point forward, which requires less fletch for the same steering effect. With a well tuned arrow, you will do fine with 3x4" feathers or 4x3". You will probably need to go up in spine. If starting at 125 gr points, add about 10 lb for the 225's, a little more for the 300's. I strongly recommend paper or bareshaft tuning with the heavier points to make sure you have the right spine.
Enjoy the heavy heads, I sure do.