Just removed the breather and installed the stock oil filler cap. Reset fuel trims with HP-Tuners and fired the car up. Checked and the oil cap is not pulling strong vacuum, which should be a good sign and that the stock PCV setup is operating as intended...

my fuel trims are still maxed at +16.4 with a lean idle. I can't hear any vacuum leaks and I was careful when applying the RTV when sealing up the intercooler core. Any other ideas on what I could be missing??