Try measuring from the berger hole to tip of arrow on both bows. I'd be interested in what the differenceis beyond the DL difference between the 2 bows. If the shelves are 2 different length and the riser is shaped diffrently the arrow will be further or closer to the rest w/ 2 different bows.

A friend has a 1" shorter DL than me but we use the same arrow due to rest position and I believe my arrow sticks out further forward in relation to the berger hole on my bow than his does on his due to the narrower riser.