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Plummet said..
15-25 is too powered for an 8m. You should have been on a 6m. next time do a size down.
Don't shift your weight by side lunges. That is essentially trying to "muscle" the foil. It will go terribly wrong for you.
Concentrale on relaxing and small incremental movement for now.
If the foil goes up and down by its self theres 2 possibilities.
1) you are shifting your weight and you dont realise it. You have to try and train out years of sloppy weight shifting riding surface boards. On the foil you have to have perfect weight distribution.
2) There is a change of current in the water. Typically driven by the swell.
Do stop saying one kite size for this much wind is correct for anyone except yourself. Depending on the foil I was on and water conditions, a 6m kite could be anything from horrendously overpowered to annoyingly underpowered.
The point with side lunges is to keep your torso upright and centered over your board, and use your relaxed but controlled bent knees to fine tune the balance and absorb the shifts in the board's trim. It's a cue, not the end goal.
If you're bending at the waist or thinking you're pushing on your front foot, you're going to be easily knocked off balance and unable to adapt to non-trivial changes in trim.
Proper balance means you don't have to futz with crutches like moving straps, standing in weird places, or fiddling with rear wing setup.
Proper balance needs no muscling.