Though I' m back to shooting Wasp SST' s now, I' ve
hunted with Muzzy 4-blade 100 gr. in the past. That
broadhead only has a 1" cut and flew like darts out
of my bow. I' d make sure your bow is tuned and
you' ve got the correct arrow spine for your setup.
Stop by your local archery shop and see if someone
can take a look, maybe they can give see what' s up.

Before bow season, I always match certain broadheads
with certain arrows. I do this by numbering each BH
and arrow with a permanent marker - 1, 2, 3, etc.
When I find a BH/arrow combination that shoots
well, I put new blades in the BH and set that arrow
aside for hunting only. On average, out of
a dozen arrows I' ll only get 4-5 arrows/BH' s that
fly like I want them to. The remaining arrows I' ll
use for target practice.

You may get more responses if you post this on the
" Bowhunting" or " Technical" forums.

...by the way, welcome to the board.
TB