That's a quality belt. Just not enough belt for the job, I don't think, a C or D being much better. Double pulleys mean you can use less tension and less side load as well. Even at that, myself, I'd incorporate a two bolt flange bearing near the pulley. Save the pump bearings, but more so the shaft. It could suffer quite a bit of deflection and eventually fail.
I was re-reading your test when you first started up with the added pump and motor drive and the sudden loading and unloading. I would be willing to bet that that was your new motor, not the hydro. I've seen it many times on the test bench where a gear motor would lock up before it got its load turning. All the pressure is on one side of the gear set, pushing the slack side into the housing and jamming it up. With enough pressure sometimes it would turn, taking some metal from the housing with it. The gears essential "machine" into the housing. Gear pumps and motors should be broke in under no load, then a series of heavier loads with a no load run in between. Do that up to your working pressure, then change the filter.
If you open your motor, you'll likely see some material gone. Ditto the pump, but maybe not as bad. That material is now in your hydro system.
You've good some great machinery there and obviously the skills to use it. Couple that with your aptitude and attitude and you're going to have a very unique and useful "toy" when you're done. Basically; You Got This!
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