The charge for this machining would be $100.00. We would not suggest it however, the wheel is heavy and inefficient and would not work well with your engine. They had more negative effects than positive, so they were replaced with the wheel that you have now
In theory the larger fins catch more exhaust flow and cause faster spool up. What was found though was that it was better to direct more flow to the turbine than to try to "catch" more flow. They also found that more curvature of the blades (instead of straight paddles) not only "caught" more air but also started the flow in the right direction reducing turbulence. We hope this helps, let us know if you need anything else. Thank you,
Oh the joys of a build taking 2+ years. You sir are dedicated. And if I liked turbos I'd say that's a pretty sexy picture right there.