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@TONY_M
I take the cleats pretty far forward yes, partly because I personally produce the most power with a greater hip angle and even with my saddle as far forward as it can legally be it is still not enough when tucked in an aero position.
Moving the cleats forward effectively opens up the hip angle slightly by moving the feet and legs back relative to the rest of the body. Unfortunately the Planet X track I race on has a very short Front-Centre and wheelbase meaning that my body position is right over the front of the bike and this is an issue for me as either I hold my body back and can't produce as much power as I can or I try to go for it and the back wheel lifts up as the weight balance is too far forward.
The reason I am after a DF3 frame is that it has a longer Front-Centre and will to some extent solve this issue, the other bikes with a longer F-C which I have tried have been fine for sprinting and I will need to change frame before an Intl comp in July. The BT sprint bikes in particular have an extremely long F-C and long wheelbases, I saw one last week at a track here and even for a short rider and a small frame it had very different geometry to the Planet X and was likely a lot more stable with the added length.
I hope all that makes some sense, it's clear enough in my head anyway.
I have seen that a few people have tried drilling their own cleat holes mainly for a more midfoot position so it can be done but I have not known any track sprinters to do so.
Cheers