^^Yes, interesting thoughts Juggernaut...
i too have wondered the same, as i have an sr22vet in a datsun 1600 with a HKS 3037 pro s with the .78 atp twin scroll rear and thought that maybe i had gone for a housing that was a bit on the small side... a .92 maybe something i will have to investigate further if i dont see the numbers im hoping for .
But as you have made 290 rwkw @ 22 psi...im sure my goal of 350 rwkw can be had on E85.
If you were in sydney i would lend you my turbo to do a comparison back to back.