it's odd, even my original 1970's wooden tiller passes cleanly over the cleat... but I've heard of several people mentioning this issue... maybe it's actually a rudderhead problem?
I bought the aluminum windesign tiller last month, and love it... I personally cant justify the carbon fiber tiller... of course I've never used one, but it seems that the weight difference cant be more than 10-12 ounces, which is roughly equivalent to a can of your favortie soda, or the difference between wet sailing clothes and dry sailing clothes.
crazysailor, IMO the aluminum tiller is just fine, clears the deck and the cleat with no problems.and costs about 80-100 less than the carbon variety.
the point of a carbon tiller is so that it can have a lower profile because of the strenght of it. because it is lower you are able to have a tighter travler and have the block still be able to go across. by having it tighter your pointing is increased by letting the block further out to the side. for some it mite be a testosterone thing but for alot of people its getting the most you can out of the boat.