First, this looks like a really old topic, but...
I've had a Banks Sidewinder (TE-06H) for quite a while. This turbo was pretty responsive and handled just fine, but wasn't good for more than about 15 PSI.
Once I got enough fuel to use all of that with a 110 CC pump, I managed to push 20 PSI out of it... but with absolutely insane backpressure. And it really didn't gain much power compared to when I wasn't maxing it out.
I finally upgraded to an S360 turbo with a .83 T3 housing on it. It... was a total dog. Just didn't really want to spool, and I could get /maby/ 10 psi out of it. It worked, but was nowhere near optimal.
Finally swapped out the exhaust housing for a .63 T3 housing... what a difference that made! It spooled great, cleaned up all the fuel my 110 CC pump could throw at it, and I hit 30 PSI without much trouble, and it didn't /feel/ like the turbo was having to work hard.
So... I'm convinced that for these engines, a small AR is important. If you need more flow, go with a larger diameter turbo, but keep a small AR.