I just purchase another radiator cap. Stant 10230 16 PSI This will be my third but at $6 a piece I would not rule out faulty craftsmanship.
I am also going to do a combustion leak test with a block tester I picked up at NAPA. I just want to rule everything out. I have a feeling my coolant pressure is higher than it ought to be given my engine temp. The block tester is a pretty simple tool and cheap piece of mine at $40.
NAPA AUTO PARTS