Any one interested in the oiling mods I did?

Duane said
Assuming your math is correct, and I am not saying it isn't, you may have just partially explained the claimed velocity issue.
Most high performance engine will have opened the bearing clearances, increasing the leakage rates. So if the feeds and the leakage have the ability to out flow the galley supply, the galley oil coming in would always be in a refill mode, so it would always be moving rapidly to try to keep up with the leakage rates.
Having said that, and I may be wrong but your math for the galley feeding 4 bearings where you said the area for the galley was its diameter, to my thinking if you feed from the front, that area should double. Visualize it that there was a solid divider between the front two feeds and the rear as if they were isolated. That has to improve the numbers if I am not mistaken.

The good news is that better oils, blocks, cranks, rods, dampers and more allow for much tighter clearances than 25-30 years ago.

And that helps a bunch. On my aluminum rod high RPM junk I had to start at .0038 on the rods and when the oil pressure started to climb, I know the rods were getting tight. Then I pulled the rods and usually they were at ~.0028-.0030 and I would hone them back to size and run them again.

Those big clearances made oil usage go up. If you didn’t get the clearance up like that, in 20-25 runs they’d grab the crank and spit up.

So less clearance, less viscous oils and I forgot crank scrapers that actually work reduce oil usage a ton, and that makes it easier on everything.