When kiting though I find it hard to feel when I'm getting lifted (wind shifts to let you head higher upwind) or headed (wind shifts so you have to head lower). It's more difficult when your "sail" is 100 feet away, and the heading of your "boat" is not very easy to keep in a perfectly straight line. Any tips?
Good question! I have been trying to find out a way to get best performance (although on a hydrofoil for me) upwind and its not as easy as in a boat simply trimming to get the angles right. For sure depower trim on the kite affects kite L/D which affects your boards maximum allowable angle, but changing the board angle might change the kite angle requiring readjustment, and subtle wind shifts are hard to pick up.
So far all I know how to trim is going by feel and then checking which type of feeling (kite angles and board angles) gave the best upwind. If anyone has better advice other than the obvious "you slow down if pointing too far upwind and go too fast if pointing too far downwind", please let us know.