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Basher said..
This is always a delicate topic because people who have windsurfed for years feel like they are being told what to do. And of course if you are happy with your sailing and having fun and achieving your goals then, no worries.
But changing to longer lines takes a while to get used to and once you've made that transition you don't find your bum slaps the water, whether in waves or not. If it does, then you are still in an old-school stance.
Once in a modern/upright stance the limit on harness line length is a function of your arm length and little else. 30inch lines are normal for short people. 32inch lines are now average, and with tall people often using 34s.
But to get that upright stance you need to get the mast more vertical, and so the change often requires shifting the front footstrap forwards on the board, and moving the mast foot backwards. Those two changes will effectively raise your boom, and so you may need to lower that, even with the longer lines. This might seem counter-intuitive at first.
If you want to get out of a stance rut then one top tip is to get someone to video you, just to see how your current stance looks compared to others.
At some point in the quest to find the right harness line length, you do hit a point where the pros and cons tip the wrong way though.
For me the 30's were that point. The reality was that all that the longer lines were giving me was slightly better gust response, in exchange for a whole lot of hurt.
Changing back to 28's actually improved my ability to hold an upright stance, and took away the fatigue from arm wrestling with the boom. Instead it made letting the harness take the weight a more natural feeling, instead of something i had to remind myself to do. As a result my overall speed improved drastically.
Longer lines do have certain benefits, but there is always a step too far. If it were a simple case of adjusting stance to suit then we'd all be running the longest harness lines available.