I decided to be cool, and bought a waist harness, as the seat one reminds me of baby nappies.



Unfortunately, my waist harness constantly slips up to my ribcage, and had to push the boom way too high...and because I'm tall I still hit the waves with my "upper thigh"
To lower the boom, and at the same time ride a bit more above the waves, I had to buy very short harness lines (20").
Just fitted them last week, and these have changed how I sail.
I sail more upright, too close to the rig, have lass flexibility to get the board going, and the rig now feels unstable when going.
I think I would benefit from a seat harness, and going back to the 26" lines.