Simons turbine is now a bit smaller then yours but the one that i put in to replace the oversize was a Biagio race shaft.
Same major diameter,exducer but a little bit smaller on the inducer and a change in fin design.
And he is only running 15.5 psi so there should still be about 10-15rwkw in it after the injector upgrade and a little more boost.
I cant wait to see some results with camshafts and cam gears, They should well and truely break 250rwkw.