i'm on 19's with joms, 5mm spacers front et 35 8.5j with 215/35 rubber. Its close.
Regarding failure rate, DPM, Awesome and Venom all said FK failed more than JOM. Jom had a 2 year warranty though dpm whereas Fk was only 1. FK is a better ride than jom but warranty and reliability so trusted the dealers.