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olskool said..Howdy Shifu, the main reason im asking advice is i was experiencing tennis elbow n wondering if longer harness length would stop or reduce possibility of further injury.

Tennis elbow, that's a horse of a different color, I also think your pic looks pretty normal.
I had the same problem quite awhile ago, and it was from playing tennis, of all things. Tennis, and other things that require full arm extension, can result in what you are getting from windsurfing, which mostly requires arms slightly bent. So actually longer harness lines can make it worse. In my case I enjoyed w'surfing much more than tennis, so I simply hung up the tennis racquet, and the tennis elbow slowly went away. So I'd say find out what you are doing that requires straight arm or over extended arm strength, and try to curtail that. Water skiing, and wake boarding also doesn't mix with w'surfing for the same reason, your elbows can revolt from that.
Also straight arms while w'surfing can result in shoulder injury. Your arms are straight and then you get hit with an overpowering gust, that shock will go directly to your shoulders because you have no give with straight arms, which also ups your chances at getting launched.
Must keep the arms slightly bent for safe, and easier sailing.
This just goes to show which answer you want to agree with, John340 won't agree with this I'm sure.