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@Dammit
Turbo is brand new 20T, TD04HL unit and tbh starting to get quite mis-matched in terms of compressor vs. turbine wheel size, the problem is that the second you move to a bigger hotside (which does significantly un-cork these engines) you are into custom manifold territory, or putting up with the turbine to manifold interface leaking like a bastard.
In an ideal world I'd have a 28/71 or maybe 30/71 on a custom manifold with an external gate.
Meth injection ups the octane rating whilst/which drops the temps, meaning more boost and more timing, its a bit of a band-aid for the current turbo really, although higher octane for an engine prone to detonate under load (as all high pressure turbo engines are) is never a bad thing.