I just cleaned every electrical connection about 2 weeks ago.Check the Earths and block connector first.
In-tank hoses are a good thought. I replaced the fuel filter last summer and they looked fine at that point so I had ruled that out but that was probably a dumbass thing to do when fuel pressure seems like the issue.Sure sounds like your fuel pressure is a problem; check your filter as well as all of the little rubber hoses inside the fuel tank, when it is running look inside the fuel tank and see if there is fuel movement where there should not be.
I had a small black rubber hose rot off inside the fuel tank and it did something very similar, had a crack in a fuel filter canister once too and it ran but like crap that time too.
btw: The test method you are using sure doesn't sound like anything I have ever read in a service manual :|
The test method isn't great, I'll give you that.
Everything I mentioned replacing I did for other reasons. I do need to borrow a pressure gauge and check it though. Didn't get the chance over the weekend.check the fuel pressure, don't just replace shit for no reason.