The reason why so many companies don't make 80 is not the limbs or riser. It's because they "skulpt the cams out so much to make them spin /rotate faster in order to generate more speed. Too many pounds on them collaspes the cams.
I had a brand new 82nd Airborne when they first were introduced. I bought the first one in the state of Connecticut from Sportmans Outpost in Wolcott. Al Dematto was setting the bow up for me before I jumped on a jet to finish it off and take it back to Florida with me.
Bow was 28 draw and 70 pounds. He was on his second shot thru paper with a 425 grain Bemon ICS Hunter arrow with a 100 grain tip and the cams crumbled top and bottom. Bowtech wanted that bow ASAP to inspect it. Remember this bow JUST was shipped. They overnighted a new bow for me, and we gave them the old one. We learned later, it simply was the skulpting that was done that caused this.
Now this bow was only 70 pounds. I am not sure 80 was an option either ? How many other 82nd's ended up with this same issue no one but Bowtech will know. This is not a slight against Bowtech. Bowtech historically been on the cutting edge of technology. The technology here was to skeletonize the cams so they turn faster nd make more speed.
So like center pivoting of limbs,which today EVERY company uses some form of, Bowtech skeletonized cams and this has spread around. Your Elite, Mathews, and Hoyt bows that stop @ 75 pounds, or in Hoyt's case 70 pounds, are all derived off what Bowtech came up with.