Thank you, haven't test it, currently away from my gaming PC. But i'm sure you fix it for good.
Anyway, regarding those who (will) complain blue mini loader sometimes too fast, i have word to say to them:
Personally i never encounter it, but i'm sure it's much lesser problem than being stuck in lower speed.
I bet they will the first one to report if they encounter the "stuck in lower speed" bug.
Second, the "too fast" problem will resolved itself, that's just how the game works. You can't overfeed your factory, the lines will backlog itself.
The same resolution can't be said if you're stuck in lower speed, it can't resolved itself.
Once the problem occur, even if the lines is not partially full and you feed the belt with full compression, it just stuck.
The only way to resolved it, is to manually stop the lines, create a full deadlock for a bit, then enabling the feed again.
OR
Create a circuit logic that can detect the stuck, once detected, it will disable then re-enabled.
OR
Balance things before it went through the miniloader.
If you say : '"OK, isn't most of us balance things out ? So they shouldn't stuck if you balance them out first"
Oh boy, you come for a treat. You have no idea how this problem is soo ridiculous to solve.
Well, for a starter, it shouldn't even happen in the first place.
This problem is impossible to happen in vanilla.
Your "universal/unlimited/whatever" balancer will not work. I know this because i try all kind of variation of balancer, just to resolve ONE lines. The kind of belt you wouldn't even look at twice under normal play can create this bug (under certain circumstances).
So no, your "sometimes too fast" problem is not even close to this "stuck in lower speed"