You have described this as what I'd call a sudden event, Kevin. Oil pressure at startup was okay and then one day it wasn't. That seems to me highly connected to something you did and using VR-1 30 weight isn't in any way the problem. Something else is and it isn't typically a situation that would be associated with worn bearings in my experience. Although running the engine with no oil pressure won't be doing those bearings any good. If you're generating 35 psi while running and your rod bearings are worn to the point your startup oil pressure is down near zero...I don't know...that doesn't quite compute as I see it.
Let's try this before you go pulling off your oil pan. Disconnect the oil line leading up to your filter (the supply line) and plug the hole with a common brass pipe plug. Now start your engine and see if you have pressure showing when it starts. What I think is that the line leading out of your oil filter is draining oil back into the engine when it is not running. Now, when you start the engine, oil runs into the filter to fill it again and that might be what is causing the loss of oil pressure until the filter canister fills up again. As I said, let's try that first.
