I have the same dimensions on my Garrett t3t4 with ball bearings (and a warranty, thanks todd:)) and I have quite a bit of lag too, boost builds around 2600 and I hit 20psi around 4300rpms. I've been thinking about going the adjustable cam gear route.
Haha! Mine does as well so its somewhat humorous that part throttle is faster than full throttle sometimes. Id really like to check it out sometime though
Should have bought a turbo without such outdated design hehe. Gotta love Garrett. Let's bandaid our bad design with a ball bearing cartridge that can't be rebuilt!
Here is the latest  in my quest to spool sooner.
I modified the blowoff valve because it sounded as if it was opening a bit prematurely, that doesnt seem to be the case but it does seem to be holding more after 8psi now so that's a win.Â
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