I have a brand new Hoyt MT Sport that I have been shooting for a few weeks. I seem to have poor arrow flight but on a very inconsistent basis. I usually shoot 3 arrows then retrieve them and shoot 3 again. Sometimes all 3 will shoot straight and hard and into the target, but occasionally I will get an arrow that seems to 'fishtail' and not penetrate very much. It is never the same arrow as I have kept track of that. Could it be my grip is different or nock point or something. I am shooting 2315 Easton XX78 arrows with 100 grain field tips. I have a 29" draw and shoot 66lbs. Any help would be appreciated.

Thanks.