One of the core features of logistic chests is the ability to assign requests based on recipes from assembly machines. Only having four slots hampers this quite a bit. Might I suggest an increase to eight stacks for logistics chests? Or maybe a two-five-ten progression in size, rather than one-two-four?
It's worse then that. Some recopies may request more then 1 stack of ingredient and bots will fill entire chest with it without leaving place for other ingredients.
I've increased size of requester chests to 10 slots.