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Maybe also take a look at the levers on the IP's. When installed they just barely clear the underside of the block without rubbing. If one of the levers got bent up just a tad, it may be rubbing ever so slightly when things expand. Excessive shims under the pumps further reduces the clearance...

Free electric stove left out for the trash works for me as both a load bank and a powder coating oven!

Are you able to throw around 50% load on it and see if it dies quicker or slower? I still recommend testing fuel pressure when it acts up. Any smoke when it starts to act up? Another test could be to leave radiator cap loose and run it. I'm curious if you have a head gasket starting to leak...

Are you testing under a load or no load?

I have seen my fair share of primary pumps ( both the square and round ) go bad. Perfect at full load 1 day, then dies after a short time the next day. Failure mode is typically that the machine will start and run but will bog down and die over time. Run time seems directly related to the amount...

The small filter is an Airtex G-17 strainer. Think last time I bought was from Rock Auto.com, I also bought from Summit racing before.

Any chance of posting a video of the speed fluctuation? First thought is a governor adjustment issue. ( incorrect droop adjustment )