It will make as big a difference as the tuner tunes!!
Given that you have already sprung the bike to suit your weight I'll assume you've also put some seat time in.
What does it do that you don't like? Have you adjusted any of the variables at your disposal? ride height, preload, clickers, etc. Did you see any improvement?
Have you owned another bike which you felt handled better? If so, how?
The point I'm making is that if you go to a tuner and ask for a revalve, then my guess is as good as yours if it will be better or worse. If you go to a tuner with some information they could probably improve certain behaviours.
In saying that, I've revalved all my own suspension over the years and been a bit fussy in that process as well. Not too many people have felt the need to revalve these (myself included) which to me indicates they are pretty good stock.. not to say they couldn't be improved a bit more.
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