Unless the results are painfully obviously wrong - I generally wouldn't expect anyone to question a tuner's decision in the tune.
Was the tuner using det cans? I mean if he was monitoring detonation and wasn't hearing any and you were both happy with the fuel level try the timing at another .5 degree in steps and see if the torque curve lifts up. If he is starting to hear det or there is not an appreciable pick up on the torque curve, drop it back to the last setting and you are probably where you need to be.
Baby steps - if the tuner hasn't used water injection quite a bit - he has every right to be cautious within his comfort level. It hurts his reputation a lot more if your engine blows than it helps if he got you another 5-8 hp. If the engine is running strong and you bring it back and he does a leak down test and sees that all is good, maybe you can get him to advance it a bit more.
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