i'am shooting a mattews sq2, draw length is 28in.draw wt.is 70# useing gold tipxt5575.3vanes 4in long the shaft is 28in.100gr.rocket steelhead broadhead.the chart from gt is saying the weight is 385grains.i dont believe i'm getting good penetration.i just deer hunt i dont shoot 3d.i thought with this set up i would be blowing right thru the deer??? oh yes, shooting thru the chronograph was 241.please advise!