Well we seem to have a difference of opinion. And you know what they say about opinions. I too have been in this game a long time. Even longer than you. So we will just have to agree to disagree.
Let me give you my experience with a spine issue I recently had. I was shooting 3 different Martin compounds with draw wt ranges from 57 - 68#. Shooting Gold Tip 5575 shafts cut to 28" with 3 helical Blazer vanes and 100 gr tips. All 3 bows once tuned properly gave excellent arrow flight with FTs and BHs (including Bloodrunners) out to 70 yards with speeds from 265 fps - 286fps. Now just for clarification I will not shoot at any animal at that distance. It just makes me concentrate more and gives me more confidence.
However, 2 years ago I purchased a PSE DNA and had the DW set to 63#. This bow shot the same arrow at 307 fps. I tuned it with FTs and shot it for a month or so until I got used to it. Then I started to BH tune. I just could not get any BHs except Rages to shoot. I double checked for fletching contact and I switched to 4" vanes with no luck and even tried 4" RW feathers. It was driving me nuts. My friend, who has the same DL as me but shoots a heavier weight had Gold Tip 7595 shafts. He loaned me a few and with just a bit of tweaking of the rest my flight issue was solved. I can shoot any style 100 gr. BH (without aligning to my fletching) with excellent results My only assumption is that because the PSE had a more radical cam and launched the arrow at a higher speed caused too much rear torque on the shaft making it under spined for that bow.