i would not consider the 75 at all. however the 85 gr tip would suit you well. consider the 85 gr slick trick i think that would suit you much better then either the 75 or 100.
this year i am shooting 85 gr slick tricks (when i get them), 28 in gt 5575 camo xt hunters with the 4 vane fletch blazers vanes. my listed foc is in the 10 to 10.5 percent range. arrows should arrive today. cant wait. bow is set at 70 lbs 30 in draw