Chain Adjustment Question

[billyedtimmy]

Ok, the chain was way out of spec after 300 kilometres (was able to push it up in the middle all the way to the swing arm, which is way more than the 15mm spec the owners manual recommends), so I loosened the swingarm bolt and tightened the nuts on each side just a little so that the wheel moved back a bit and got the chain to the right setting and tightened the swing axel nut back.

Well, as best i can tell, I have both sides set exactly between two of the guide 'notches' on the swingarm, so according to the specs it SHOULD be aligned. However, when I put the bike up on the rear stand and ran the bike on first gear, I can notice just a bit of wheel wobble. Not huge, but it is noticable. What the heck? I loosed the axel nut and tried adjusting a bit again, but as best I can tell each side is as close to the reference line as the other. Am I missing something? Why would it have any wobble at all? Admittedly, I need a torque wrench to make sure I'm tightening the axel nut to the 56lb/ft specification, but I got it pretty tight already, so I wouldn't think that would be the problem (but is it?).

Any advice appreciated.