Oil line plug/ low oil pressure on cold starts

The lifters were probably overkill... I had heard so much about crappy lifter quality that I wanted something that lasts. Didn't necessarily help I guess. As far as I know it's a stock cam and stock springs. It's a daily driver and not a race car. I already took the intake off to fix the coolant leak, so now I will probably take each of the lifters apart, clean and inspect them. I was under the impression hydraulic flat tappets needed 1200 ppm ZDDP, but good to know that a stock engine will only need 800.