***UPDATE**** RESOLVED: Really used and stretched ARPs were the cause of my headgasket failures. Head would lift at 30+ psi. I was running 37psi 
New studs fixed this issues***
Some Background:
Blew out my composite HG earlier this summer.
Replaced with another OEM
Week later a valley formed and peed coolant on t-belt side of cly. #1
I then replaced it with a Mitsu MLS, and had the head resurfaced.
2 weeks later, I start hearing an exhaust leak noise at WOT and High Load, CEL comes on for Knock.
Fixed a loose wastegate, and an exhaust leak. Still there. Pulled head today:
Evidence of Cylinder number 2 leaking combustion gas on the firewall and radiator side.
Black coloring on cylinder head, top and bottom of HG, and block. That area the headgasket when layed in a free state is bulging and has debris inbetween the layers.
I have been
reusing standard ARPs that I got
3+ years ago, and have been retorqued many times.
Any idea why this happened?
Found My WOT Exhaust Leak: Why?
Threaded Mode