I wouldn't use Z1 either.
Sebastian at Specialty Z would be my go-to. Heard nothing but good things about Vinny at R/T Tuning and would not hesitate to go with him either. Dynosty is a solid option as well. Another option is Jon Visconti, who was one of the first VQ guys to work with Ecutek - he can be a little rough around the edges, but his knowledge is up there with the best of them.