havn't read the rest of the topic so sorry if already posted but, by the looks of it, you don't have much control and you don't look like you've been riding to long, if that is the case then your gapping will get better slowly as you improve, but gapping that is still pretty big!
EDIT: also judging by the video the gap is slightly up? if not then the pallet has a definate slight tilt facing the curb, try gapping the same distance but from the pallet to the curb, as you get further takeing off from a slight slope
hope this helps <3