Hi, I just saw this issue, I checked miniloaders speed, right after this last update.
I dont know if this is just the description or the actual speed, but miniloader doesn't change its speed from basic miniloader, both have 15 items/s
This mod hasn't speed_per_tier, but base_speed 15 and every next level will be twice faster as before.
If you see that the speed of something is not good, please send me the screenshot of your problem or the save game file. Probably the problem comes from another mod incompatibility.