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thedoor said..
... Also, don't sheet out when the foil starts to overlift, this usually decreases mast foot pressure and increases the liklihood of crash, turn up wind instead.
This is a hard one and I agree with thedoor's general point. But, imho, it's a bit more subtle than that. Foils are quite sensitive to weight distribution in a way that regular boards aren't - as you are discovering. For your first several times this will feel overwhelming but soon it becomes muscle memory like most of what you do windsurfing.
If you just sheet out in a gust and take pressure off the mast base, yes, you will rise exactly when you probably don't want to. So, you can sheet out if you can still maintain pressure on the harness, downward pressure on the front hand or shift your weight (hips, shoulder, head) forward. You can also compensate by moving that back foot a touch forward (reason #17 starting off without backstraps helps). So, you can sheet out if you do something else to keep things in balance.
I bother to mention this because the opposite is also a problem. A lot of beginning foilers will move their harness lines too far forward. When a gust comes, they have to pull more strongly with the back hand which drives against the back foot. Essentially, you've created the same problem - too much pressure in the back and the board rises.
The next time you get hit by a gust and you'll rise more than you want, you can think back to this and figure out why it went wrong and what's the easiest thing for you to do the next time to prevent it.