This isn't meant to convince anyone of anything, and I'm only relating my thoughts...not advising.
I've seen and known of more than one moose not recovered due to poor penetration and less than optimal shot placement. Moose are surprisingly quick and things often happen suddenly at close range. That perfect broadside shot at a standing bull is like a slow pitch down the middle....you're happy to see it but you can't depend on it. I like a bow with power.
The advantage of an exit wound is hard to overstate. Moose terrain is often very poor for blood trailing, and all possible blood on the ground is desirable. The farther a moose runs after the hit, the worse things tend to get in terms of recovery. Think "farther away, into a swamp or water, into nasty cover" and you've got it.
The best blood trail is the one you don't need. I've watched every bull I've killed go to earth, and I'll take that every time over the best blood trail. Those shots were all accurate, and they got total penetration. I used enough bow to feel certain of it happening.
My favorite bows for moose and caribou are around 64 pounds at my draw length of 29". I would say 55# is my personal low limit, considering my experiences and seeing the results I've seen over the years. I'm sure I could kill with less poundage, but I like a fairly heavy arrow and head while trying to minimize trajectory out to 30 yards.
My average shot distance on moose is just under ten yards. I prefer a semi-wide 2-blade head in a single-bevel configuration. I shoot the Abowyer Wapiti and have used them exclusively for many years. Carbon shafts will almost always exceed wood for penetration, but I DO shoot really good woodies I make myself. I've killed moose and caribou with both arrow types.
Accuracy beats everything else, but I can't count on being accurate 100% of the time. I'm just not that good of a shot....and that's probably why I work really hard at getting extremely close shots.