^ bill, you are saying 10s is long enough right?
Im adding two check valves to my return system...although again..i dont understand why it has an effect since i have an electric pump
1 will go before the filter inlet, the other will go right after the IP return. I assume they have a 3-5 psi cracking pressure so the IP one will stay closed even if it drains back from behind it.
Or..should I just add the check valve all the way back before the fuel tank return..?
I don't know why laserjock was @ ?? me. Thought he was asking if it was Me.
At 45*F , 10 seconds is not long enough GP cycle.
Couldn't answer yesterday, my right thumb and 1st finger is numb for some reason.

Spilled a bowl of bean soup on my keyboard, had to buy a new one.
In regards to your injector that was wet, no problem there, if it can hold a fuel bubble on the end for a couple of minutes, but the pop pressure (1650) is low, that's why when you retarded the timing it started better.
I wouldn't be putting any check valves in, just another place for trouble. Your electric fuel lift pump should have one in it.