To be honest
@MattMan81 my experience was similar to what you described. I hunted with expandables from a 70# bow for probably decades and killed a lot of deer with them. I never tuned my bow because there wasn't a need, the expandable hit exactly where the field point did so it must be good right? I did find it strange though that I can't remember a single instance where I achieved a complete pass through where the arrow was sticking in the ground after the shot.
Originally, long before I had ever heard of Ashby or the RF, I attributed it to the fact that I was shooting ultralight arrows and they just didn't carry enough momentum to pass through. My solution . . . heavier arrows tipped with the same expandables, still no tuning. Lo and behold I had the same results with those.
Next step, a switch to three blade, fixed blade broadheads. I suddenly found that my broadheads didn't hit in the same spot as my field points. I had to tune my bow to make them work. Suddenly the same bow I've been shooting for years is pushing my arrows clean through my target block. Wow, that block went quick . . . turns out that my arrows had been unknowingly loosing energy realigning on impact all along.
Since learning more of the Ashby and RF theories I have taken things a step further and made the change to heavier single bevel broadheads moving my FOC from ~7% to ~18%. I have yet to shoot anything with this combination but I certainly can't wait to try it out. I'm anticipating pulling arrows from teh ground rather than finding them somewhere along the track line.
Maybe I'm drinking the koolaid, I won't know until the time comes, but it doesn't matter since I already know I'm shooting a better setup with my bow properly tuned.