Though I'm kind of partial to Snuffers myself
I wouldn't recommend the big ones with your setup. Dad designed those heads primarily for shooting whitetails out of treestands with heavy bows (at least by today's standards). Back in the day 65lb bows and heavy arrows were the norm, that's changing today. I tell guys that I'd consider around 50lbs and comparable arrows about the minimum I'd use with the big Snuffers, out of an efficient setup. You are giving up a bit of performance with the Hill bow, so I'd opt on the safe side. (I like to shoot Hill style bows myself, so I'm not knocking them, its just the reality that you give up some performance with them).
That said, the discussion between "big Snuffers" and "Grizzlies" is really the extreme on both ends of the spectrum. You CAN go smaller than the biggest head WITHOUT going completely to the smallest one.
If I were in your shoes - hunting small bodied (relative to the Midwest) whitetails in heavy cover I'd use a bit narrower 3 blade or a big 2 blade with bleeders. Woodsman or one of the similar heads or maybe the big Zwickey or Magnus with bleeders.
My experience may be atypical, but over 30 years of bowhunting I've not had "penetration problems" when things go wrong - more like blood trail issues. My experience is that hitting a deer too far back (easy penetration) happens more often than too far forward (and penetration issues). Too high (as in above the spinal cord) isn't lethal anyway, so penetration up there doesn't matter.
Just another opinion...and you know what they say...everyone has one!
Good luck
R