Boostworx
Have had my ca18det, rb20det, sr20det and also rb26dett tuned there over the years and never had any issues. There's always GTR's in the workshop so they definetly have RB26 experience.
My R32 GTR was making 314.7rwkw @ 19psi with R33 engine, -7 (N1 turbo's) 550cc inj, bosch 040, power fc, sard fpr, standard afm's, turbo back exhaust etc.