element tuning solved the problem, but they keep it an industry secret for them.
you can read about what problems they found here
http://elementtuning.com/competition...r-wrx-fa20dit/
and they call out pressure problems
"What happens to oil pressure when you increase the oil port size? What happens to you oil volume requirements when you need to feed two journals with one main? Guess which one failed?"
there is a thread here about it too, where they talk about their problems
https://www.ft86club.com/forums/showthread.php?t=63723