Hiya Daz...I have read it...but to be honest, running a hardtail frame I feel the bottom/ midrange power the 36's will provide is a better bet than the 38's.
To be honest...anything over 120 and you are really unsure if you are getting out alive...
It will mean a good/ clean set of 40's, with inlet rubbers and Pipercross filters will be up for grabs later in the year if anyone is interested...had new diaphragms only last year...