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Yeah, I second pretty much all that.
I'm still on the original head gasket that the car came off the lot with. The head has never been off. My car doesn't seem to like much more than 20 psi on pump gas, but at 22 psi, with a dash of race gas in the mix, the small 16g pushed about 35 lbs/min which was good for 11's (three in a row). That was just one track visit two years ago; unfortunately, I was only able to run the car once in the past 6 or so years (stationed on Guam, moved to Michigan, blah blah blah).
If you ask me, 300 hp on an EVOIII 16g sounds low. The fact that it's taking 20 psi or more to even get that far tells me that something is missing: cams. The great thing about adding cams to a 16g car is that it really makes the turbo work hard to keep up the boost... meaning, you can make more power with less boost which is a good thing on the 16g, since it doesn't seem to like all that much boost (at least not in my experience, not on pump).
As far as injectors go, 650's at least, I would have to agree with that. 550's are pretty much maxed out on my car. I wouldn't call my tune aggressive at all; the key is just getting the engine to breathe better so that you don't have to run crazy boost.
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