I have a 3.50x10 rear and 3.00x10 front Michelin S1. It is not a motard bike, but I really like it and they seem to stick really well. There are no problems with tire roll, but I agree that the stock rim is too narrow for it, needs to be at least 1/2"wider.
I have a set of Sava tires that I ordered to try out, but never installed. They have great compounds available... but the sidewall is huge! I cannot fit the 3.50x10 (only available size on the MC18) on my bike, it is probably an inch or more taller than my 3.50 Michelin! These are designed for scooter racing. They need to make 2.75s, 3.00s and something with a shorter sidewall and I would be all over them!
The Continental Zippy 1 is supposed to be great too... I have a set that I will be trying out to see how they work.