I suggested way back in your original posts about doubling the amount of oil in the pan to see if it took longer to lose pressure and a few guys even suggested that you consider it,but evidently from reading thru all your posts you haven't tryd that---


Is your pick up still one inch off the pan bottom? Is the bottom of the oil pan sloped????
how wide and long is the bottom sump of the pan?????are the baffle doors in the pan installed correctly and move freely in the correct direction???????with the pan off and setting at the same level as when on the engine stand, pour oil into the side cavities to see how well it flows into the pickup area---------


With the pan off the engine and setting supported somehow on the floor(or bench--you can do this on a milling machine or drill press also) run the pump with your priming tool and the pickup immersed to the 1 inch level and see how long it takes to pump the oil out( you will want an old main cap and fix a hose or tube to it to route oil into catch can-----


Get a set of old valve covers and cut the top out so you can put on the heads on the stand and also remove the intake manifold so you can run your priming tool and see the oil flow to the top and return(or slow or no return ) from the top end----We have see many instances of aftermarket heads not draining back very well and with some of the aftermarket valve covers(big, fabricated,billet looking BLING?) will hold more oil that the pan causing a dry sump shortly after startup-----------


So good luck and I'm waiting------------