Belt Configuration

[Madison]

I think you're fine as is if the rightmost pulley is driven. You won't see a performance gain for the extra few degrees of wrap the front gives you.

Is there any reason why you're using unpowered timing pulleys in the middle and leftmost locations? They're not driven, so they don't need teeth. Similarly, they could also stand to be smaller.

Finally -- don't forget to make use of the EDIT function at the bottom righthand side of all of your posts. It helps to keep the forums clean and makes it easier to find information while searching.