Keep trying. Respect of kitefoil starting, you have a motorboat planning start here, don’t know how to put it down in English, I’m not native… The board either you lay or keen on it than if you stand up soon, will lift the nose and keep it up untill it get up to steady planning!
Two ways: push down with front foot while accellerating (be ready for the kick up, though) or keep increase speed very slowly up to planning speed.
I found my kite wings to require quite a back foot pressure to stay steady foiling, angle down the stab (rear wing) improved a little, then I need to step back on the board, in a position I cannot take while motoring up to foiling speed!
Give your setup another chance, go straight for the max S you can and go, first like a kneeboard (it’s insanely fun!!) Then with your throttle control dialed in, stand up!
I noticed big help from a super smooth and slow accelleration ramp, 2.9 sec VS. 2.2 second to go from 0 to full throttle makes quite a difference…when foiling steady slightly faster reaction is better in adjusting speed and stability, but as start, very long ramp will definitely help! Pistol style remote.