it's been a while since I used the hover glide set up on the wing craft 90L, but I think I did have the back of the base plate on #4 (maybe it was #5)....yes position B if you find the foil a bit pitchy you can also use the longer fuselage it takes a bit more pumping to get the foil up but the foil behaves very well.
The front straps look too far back if you are in the early stages of winging, move them to 2nd hole from the front, as you progress you may move the back or if its cranking windy.
As motogon said you could probably take them off if you are literally just learning, it's one thing less to worry about
I have the phantasm foil at #4 and foot straps third hole from front.... enjoy your board and foil its a great set up you have!