Hello, regards jetting etc, i have just spent the past two weeks doing the same, I have a bsa C15 trials fitted with a new 622 and PVL, after some nights of buggering about i have found it runs best on the following 106 needle jet, middle slot on needle, main jet on 140 and no3 slide. i am running a cone type air filter.
Hope this helps regards Bsaweezer.