My mod has 3 tiers each with 2 types of belts - powered and unpowered, the unpowered version with 0 i/s. Your mod makes the unpowered version 7.5 i/s. It should only modify the powered express belt, splitter and underground belt (powered-express-transport-belt, powered-express-underground-belt, powered-express-splitter) to 120 i/s.