I just ordered a Kenda K760 rear and a Pirelli Scorpion XCMH front for the DRZ.. We'll see how those work out. I've never used either of them... They won't be here till Monday though so this weekend if I get any time to ride I'll be on the F650....
This weekend I'll most likely be using my spare time wrenching on my truck and the DRZ..
When in doubt, gas it. It will either fix the problem, or at the very least end the suspense.
07 650GS / 05 DRZ400S / 72 CB350 (that hasn't run since shortly after I bought it)