The bigger turbo/billet wheel/race cover will move the compressor efficiency up and to the right. That is a good thing when you're running big boost levels and turning a bunch of RPM.

However since you're running at such low boost I would actually expect to see the IAT get slightly worse at 9psi. Why would that pick up 50hp?

What trendz is trying to say is that different turbo's, CID, boost level, heads, etc... Will all want a different cam grind. Some combination of the above will be more like a Na cam, and some will want something more obscure.

Some turbo cams are ground with a reverse split duration, some are not.

Too many factors go into it to generalize anything.