As you know our sport is moving to a bigger area wings, So:
For all SUP foils or bigger than 900 cm2 you must use it close it to the tail set up
Like the MFC 1250 or Moses 633, etc..
For all kite foils such as Moses 550, 590 etc, please use the front placement
Rule of thumb is the foil is (nose happy) too lifty, place it by the tail
and if it doesn't have much lift then products