I havent heard a complaint yet over the work we do at MIC. Yes, people have brought back their turbos with problems, but 99.9% of the time, its either the BOV ceased, the wastegate is stuck and the turbo wont spool, theres a crack in the piping and therefor a boost leak, etc.
As for dealing with my father, yeah, with your situation, deal with him personally. Especially since I wasnt involved from the start. Good choice with dealing with him directly.
Just stick with the T28 cartridge in your T25. It will definately produce your goal hp, support well over your desired psi, as well as spool up faster than a t3/4. Not only that, but the whole sleeper look is quite sexy
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I know youll be satisfied