How long has it been since you checked the tilleron your bow?Just in case you don't know, that'sthe measurement from the belly side of the limbs at each end of the riser to a string stretched across the axles. It sounds to me like it's off.

I've posted my way of adjusting tiller a hundred times and my fingers are being real lazy today. Just do a search on tiller and I'm sure you'll find it.