Hi Dallan
Most folks always question results. So what I post below is not bragging. Please don't take it as that. I've shot over 100 animals with my bows. I've shot fixed blade with super success. I've used replaceable blades, also with good luck if you choose a good brand.
I let my wife shoot expandables one year to see about bigger holes and better blood trails than her 2 blade Zwickeys were giving her. After the one buck and a few wild pigs I was thinking I'm sold on them.
Mind you I was a taxidermist full time for a number of years and a hunting guide for about 5 years(family got in the way but is well worth it). So I've seen lots of results, lots of animals cleaned. I always check out wound channels to see. After seeing the results of shooting about 300+ deer for 5 years straight I've formed some really solid opinions on rifle calibers and bullet selection. Same goes when it gets to archery.
Bottom line is you are correct on autopsy results. The last deer I shot with an expandable(mind you my only experience was with Wasp) was finding the arrow with broadhead intact and the retainer band for the blades still set where it was when I shot. Not opened and closed again etc.... And the deer proved that. The hole looked about like a Judo head went through the lungs. Not an open broadhead.
Again, mind you I stopped using them after that so I can't commment further other than a buddys years of success with Puckets. My thoughts are that fixed blades take a bit of work but I've run them through 300 pound hog skulls, through both shields of a 450 pound boar, through shoulders, spines, and all kinds of structure and they have always performed well. So I'm kinda stuck there with whats proven. Especially since its nice to say put it in the right spot, but it doesn't always work so I go with whats been proven to me over the years.
So while you may have found a super open on impact head, I just can't go there in my own mind. And since family time is important I just don't have the time and funds to keep buying and testing. I'm afraid I'll be testing a new head when the buck of a lifetime walks out. To this date the biggest deer I've managed (not in a quality area) have been taken with Snuffers and Muzzy 3 blade. Both hold together extremely well in my experience.
Again, I hope no one takes my fair successess as bragging. I just want ya to be aware I've got a bit of experience under my belt when I type. When I don't know, I ask all I can(go look back at the MZ threads- new to the new guns and needed and still need lots of help there)
Respectfully, Jeff