The rubber seal at the manifold might be repairable with RTV. No, seriously, I've done it -- not on this bike, but with others. Makes a good repair that lasts a long time. Any auto parts will have heat resistant silicone, or RTV, in a four dollar tube. Just smear a coating all over.
The wobble could be that you tire is not seated properly. Look all around the rim on both sides. Inspect closely to make sure that the bead is evenly seated on the rime all around. This happens on my KLR when I deflate the tires to run in sand. Then I have to pump the tire up to a hundred pounds and beat on it to make it seat right. Then deflate to the regular pressure. If you let it go too far unseated, then you wind up cupping your tire, and have to buy a new one. Darn thing can balance up right and not be seated all round.
On your way from Montreal to Tennessee, feel free to drop by chez Ocelot. I have a garage full of bikes, a tray full of wrenches, and the hubris to think I can't screw it up worse than I can fix it, whatever it is. There's even a spare room.