Vpa 150 gr help!

Joined
Jun 10, 2018
Location
Otis Orchards Wa
Ok guys need your help. I bare shafted my bow with 145gr field points and it is nuts on out to 75 yds. I just bought some 150 gr vpa unvented three blades and shot em with a group of field points. Problem is they are grouping 8 inches low from 25 to 55 yds. I was expecting a little differance from field points but not 8 inches! I was shooting 125 gr magnus buzzcuts but wanted a three blade coc head. I also use a hha single pin slider so i cant just change my pins. Any help or suggestions would be appreciated!
 
Yeah, I shoot those heads. Its probably just a tiny adjustment to get them dead on assuming the arrow is assembled and spinning perfectly.
 
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