I have hard time to bear away my wide slalom/formula boards

Can you tell me what is technique to bear away when planning in both footstraps?
I have three solution in mind:

a)
Are you move sail forward just like in non plannning situation,or board will not respond any more to sail movement when planning?

b)
Or you turn with scissoring board with legs,front extend,back bend?

c)
Or heel to toe pressure,can slalom board turn downwind if I put both foot toe pressure?

(I try with toe preesure but nothing happend, because footstraps are on slalom boards on rails, so I can not tilt board to leeward to start turnning downwind..this works only on boards where footstraps are in centerline(wave,freestayle..) so you can carve/turn the board with both feet in straps..)