Miniloader support with custom belt speed setting on currently does not automatically change the speed of any loaders to the updated belt speeds. At low tier, the miniloaders are faster than standard which is workable but if you have Bob's Logistics when they add the higher tiers the newer belts are almost double the speed of the miniloaders.
Looking around in the files, it looks like the Miniloaders is supposed to run a data-updates.lua to catch any belt speed changes by looking up the underground speeds done in any other mods data.lua, but there is a few issues with this implementation (mostly because of how GUFT modifies the belt speeds in the data-final-fixes)
Is there anyway to have compatibility added to Miniloaders for changing their speeds too (overwriting their own method possibly? From testing I can't actually get their way of updating speeds to work at all, either by changing load order of belt speed modifications or just attempting to hardcode speeds in)