I first used the 92cm phantasm mast for wing and windfoil when it first came out and it worked really well.
Then I switched to the 82cm for winging only and that's all I use for winging.
Couple of weeks ago I was foil testing the new G-series foils and felt that the 92cm was draggier and much more so in tight transitions
(I only use the 92cm now for wind foil). Even in heavy ocean swell I still use the 82cm mast! Hope this helps...