In reply to John Roberts (JR):
ironically sitting in my office less than 2 miles from Facewest.
Sounds like the new skis are a powder ski at that width. You could try existing 110mm skins on new skis - should be ok until you get on an icy traverse. Then the fun begins. So yeh, 120 mm for peace of mind and not p***ing off your touring buddies.
Again the 110 mm trimmed might do it- if the shape is such that only a few mm are showing on the base - about 5-6 mm at the widest part of tail.
Warning some retailers are selling off the old orange or grey STS skins that are stiffer & do not perform as well as the more recent model from BD.
Davie