Ok, I'll weigh in here.
First, I shoot 90 gr. 4 blade Muzzys. Always have and probably always will. Excellent penetration. Always a pass through, even when hitting bone.
Only one exception, when I made a bad shot on a deer almost directly under me. I hit backbone and rib and still went all the way to the bottom of the cavity. Dead deer in 70 yards.
Second, I would never take that long a shot with a bow.
I've practiced at 45 yds, but it would have to be mr. right for even that long a shot.
Not to criticize, but at 55 yds, a deer can make a lot of movement before even a fast arrow reaches him.

That arrow had to be dead in the water to only get 4-5 inches!!!
The broadhead isn't the problem.
I've got too many 4 blade Muzzy kills to believe it was the broadhead.