Id say shoot and enjoy your rifle Skot if your getting consistent good groups from it.
I used Davy's HW97KT for HFT this Sunday just gone and that is straight out the box. It shot brilliantly, far better than I could shoot it.
I wouldn't have scored many points more with my own I don't think, maybe no more than I did.
A tune makes it smoother, less recoil and probably more consistent but if its shooting well with no problems then Id say be happy with it and save your money till its ready for a tune.
Then you will get a new rifle back from Tony Wall believe you me, ask Pianoman