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baywavebill said..
... I have just put 26 inch ones on. I know it will feel weird but what tips do people have to stop my bum slapping across the waves? I am only 173cm tall. Shouldn't people with shorter arms use shorter lines?
You are using shorter lines. I'm 183 cm and use 30 inch lines. I'd prefer 32, but those are a different brand and tend to break suddenly.
Funny that Battle suggests the Figure 7 stance, and then posts a Matt Pritchard video. Figure 7 is great for flat water, or if you are sailing fully locked in (think PWA slalom). Considering the "wave" in your name and your post, you're probably doing neither. Matt's #2 suggestion for sailing in chop is "bend your knees" (his #1 suggestion is longer harness lines). If you look at the video, you'll see a stance that's between a figure 7 and a figure 6 stance (more like a "bent knee figure 7 stance").
With short harness lines, it is common to rake the sail far back and to windward. That made perfect sense with planing longboards and sails that had a limited top end. With longer lines, you can (and should) keep the sail more upright. The longer lines allow your body to get into the same position out over the water without pulling your rig to windward. Having the sail more upright will let you use a smaller sail, or go faster with the current sail.
Having the sail pulled to far windward would be my bet on the cause of your butt slamming problem. A less-than-ideal stance with the butt hanging out too much may also contribute. Hip position matters! Keep the words of a great windsurf instructor in mind: "Think fornicate, not defecate!"