If you have an untuned bow I don't see how you could hit a deer anyway.
Someone that knows how to shoot can get away with a lot. A few years ago Bill Leslie borrowed a selfbow from one fellow, some wood arrows from another, and even though they weren't matched at all he placed in a big tournament.
I'm not in the same league as Bill, but I can take an untuned bow and mismatched arrows and still hit a target at reasonable hunting ranges. The simple fact of the matter is an arrow that isn't flying straight, i.e. isn't tuned to the bow, will not penetrate well.
An 80 pound bow and it won't pass through the lung area of a deer? You think that is a tuning problem ?
I don't know what else it could be. That kind of poundage would push a blunt point through the lungs of a deer if the arrow were flying straight. The only way I can think of where it wouldn't penetrate is if the arrow were flying near sideways, i.e. not tuned.
I have been at this a long time, apparently longer than you.
Could be, but that has nothing to do with anything. I've seen folks that have been shooting literally for 40+ years that knew less about what they were doing than some guys shooting just a few years. FWIW, I've been shooting traditional bows for close to 20 years--somewhere between 15 and 20.
I may answer some questions, but you can not get the "feel" of a bow for someone else.
I never said otherwise.
There is half a dozen things that affect the problems you mentioned and none of them has anything to do with "Tuning".
What are they? I bet I can relate most, if not all, to tuning.
Chad