Hi.
I installed your mod and didnt notice that it doesnt send the items to the network, it does in fact throw them to the ground.
Now, the problem is that I had Warehouses (mod) with thousands of items and those got thrown all over. Unfortunatly I didnt notice this because I use the warehouses in remote locations. And thus saved with this state -.-'
... yah, what a mess.
Anyway.. there is a mod called Overflow Chest that needed to solve the same problem as you: send items back to the network.
In their case, the chest works like a better buffer chest by switching from requester to passive provider on the fly. In your case, what you could do is instead of converting to passive provider, you could convert to active provider, thus forcing bots to clear the contents of the chest until you are good with the amount of things in it.
You could, if you wanted to mix items, spawn an hidden active provider and then transfer the "excess" items into it. Bots would pick stuff up from that instead.
Unfortunately, with the current behavior of throwing things to the ground, this isnt very useful