Never been a big fan of St Joseph or Croze blancs.
I wonder why they bother trying. So this is not surprising to me.
I enjoy good white Rhones -- aged white Hermitage may, in fact, be my favorite type of dry white. I can't say I've had many white St. Joseph or Crozes-Hermitage, however, FWIW: the 1998 Chapoutier St. Joseph Les Granits Blanc is a fabulous wine, imo, so, at least, I think it can be accomplished in St. Joseph.
"What contemptible scoundrel stole the cork from my lunch?" -- W.C. Fields