I had an Arctic Ultra, actually two, but thats another story.
Anyway, it carried 50-60 lbs as well as anything I have used. My thoughts were the same as yours as far as packing elk & deer parts.
I ended up selling them because where I hunt elk there are enough griz & wolves that if you don't get it out the same day you might not have much meat left.
Last year I packed out three elk in four days along with a partner on each trip. We boned the elk and packed everything in one trip each. The heaviest was a bull I shot, where my pack weighed 125 and my buddies was 135. Not ultralight for sure. My Granite Gear Stratos Flatbed worked well but I liked my friends Kifaru Longhunter enough that I bought one for this next season.
I think the Epic would work fine for mule deer, sheep etc and even elk with reasonable loads. I might try one out myself.