If your happy with the jetting the way it is now then leave it and take a little extra gas with you. You don't want to lean it out trying to save fuel.
I run the Kenda Kutter XC's and we ride everything from grass to rocky hills and I love them. First set though so I cant vouch for how long they wear but they bite great.
I ordered a standard J Arm kit from Tim and it showed up yesterday. Beautiful craftsmanship. Fit and finish are superb. Great communication. I would highly recommend Stellar for any of your fab needs.