I'm skeptical of the new oil pickup tube. There could be something wrong there causing it to not pull oil. Was it braised onto the cover right? I forgot whether you mentioned if you packed the pump with grease and primed the passages using the front port.
If it were me I would pull the pan and blow up the pickup and see I'd it is a tight fit. Would't be easy, but I have been known to get some oil in my mouth just to check out an engine.