There will always be this argument about power/dyno figures....every dyno/operator is different i have done myself and witnessed on the same dyno that with the way that i strap my car down/mates/customers cars down and not using(cheating) the temp probe that my readout was 17-25rwkw down on the other guys readout, ie same conditions/tune/dyno...but with your case go back tell him to load your std tune then run it, then load your tune, run it and last load his tune and run it at his expense not yours and then overlap the runs together and he can see that his work is substandard and give you your money back or fix it ..bigdaddycool mate dont leave and i mean dont leave until this is rectified because he and yourself can see in plain english/readout that it aint any better than when you went in there the first place....i would never and i honestly mean never would i let this happen to me or would i never do this to anyones/customers car