pull cometics and install OEM (copper coat them) and then your problems will most likely be solved.
Cometics are becoming increasingly prone to leaking boost pressure/compression etc into the coolant system. The only MLS gasket I would ever suggest running is a Tomei. While they are more expensive than Cometics their features are by far the best on the market for an MLS setup. If you can't spring for Tomei gaskets I'd advise my first statement above.
