We are trying to develop a new system to replace the #35 chain that we have used in the past. Typically we would run two short runs of chain each start from our drive wheel in the middle. I am trying to design a system that uses a timing belt and one long run. The drive wheel is still in the center. Currently I am designing the system with 3/8 .2 pitch timing belt, with 28 tooth pulleys. The center wheel is dropped 1/8". I have two idler gears to adjust the tension and to draw the belt into the drive gear. I am wondering if I should step up to a larger belt, also do you think there is enough contact between the belt and drive pulley?