I seemed to have done something to fix it. It seems that Jazmod tweaks increased the amount of things the belts can take in before filling up. Anyways its a great mod. And i hope this can help you and others as well. Just reduce the stack size multiplier in Jazmod tweaks.
Beltlayer buffers a fixed number of stacks because it’s just a normal, if invisible, chest. Anything that changes stack sizes will affect how many items get buffered.
I'll expose it as a setting in the next version. For right now it tries to calculate the number of slots automatically based on belt speed and 50 items per stack.
Oh I see now. Thanks for the reply. I know its an early release but it doing good for a new one. Looking forward to your future updates. And again great mod. I can see alot of potential to it.