This morning I did check, loosen & re-torqued the fork clamp bolts, spindle & nut (hadn't checked em since the new rotor went on in Jan) & went round the block (2 mi). That seemed to help a bunch. (e.g. slight wobble @ 30mph, none @ 40+). Makes me think it's the front tire tho.
So, because of the time constraints, I'm gonna roll her into the dealer, havem them mount & balance an ME880 110/90-18 and lube/check the headset bearings along with the other 12K maintenence stuff I haven't already done or don't have tools for.