+2 for the 908, but ya gotta have deep pockets for them now. The Mefo is good as is the stock Scorp. IMHO. I just ordered a new Tractionator! We will see how this does, at least it is affordable. The TKC is also good, I like it best at about 3/4 gone!
Yes the 150 is the right size for an Adv. with a 4" hoop.
Hope this helps.
Take care, Eric.
"If my Technique Improves, so will my riding"!