Hi there, Board size first - 85KG and importantly with foil experience - Sky SUP - probably the 6'7" or even the 6'3" if you want a good size which you can also use for winging. Re the Bee, for sure the smaller model, 7'8", must be big enough for you.
Mast fuselage I would go for 82Mast, 78 Fuselage. 1750 is probably a good choice then as an allrounder for getting the most out of SUP foil and winging. 2000 will be the easiest to learn on, but honestly as an IQ foiler, you really don't need such a big foil as the skills are already there.