i have used both mojo and tftuned but if the fork is over a year old and therefore out of warranty i would prefer to use tim at tf tuned, reasons for this are as follows,
fox bushes suck, they don't last very long generally and if you don't service the fork very regularly they wear out and damage the stanctions which means replacing them aswel as the bushes and the uppers cost £145 iirc let alone the service cost itself.
tim sizes the bushes more specifically to the fork itself and he also told me the standard bushes work harden and become sloppy hence the leaking that fox forks can suffer from.
trust tim, he is THE man.