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mantas99 said..
I hear people saying to change to longer harness lines, but that is somehow counter intuitive - as longer lines would mean that I would need to lean more back to make use of them.. but then maybe I should move the boom higher.. but then it makes more difficult to waterstart..
Longer harness lines do indeed increase the distance between you and the sail. That means
either you can lean out further,
or you can have the rig be more upright. Leaning out further can be the goal if you are speedsailing or slalom sailing in chop. But in your case, getting the rig more upright is the goal. That makes it easier to keep more pressure on the front foot, and thus less pressure on the back foot.
For many windsurfers at your level, the more important thing is to use the harness more, and the arms less. That transfers pressure all the way from the back foot to the mast foot. It is very natural to use the arms to hold the sail, especially when a gust hits, you go over chop, and so on. Without even knowing it, we temporarily take some weight of the harness, which puts more weight on your feet, which leads to spinout. With a GoPro mounted to the end of the boom, you can often see the harness lines bend a bit. If harness lines are short, that tends to happen a more.
When you are sailing in the harness, the grip should always be very light - you should be able to "play the piano" at any time. One thing that can help is to have the thumb on the same side as your fingers - it it's on the opposite side, we tend to grab harder. It can also help to sail one-handed for long stretches, since that can force you to use the harness a lot.