Um well. This brings in a question: can there be an EBF with mixed hatches? E.g. MV energy hatch, LV input/output hatch.
The thing why I did it with so much wasted stuff is that I have a lot (a LOT) of lithium, and everything needed for LV is plentiful, but I don't have any easy-accessible Alumium veins.
The reason your EBF is only drawing from two of the buffers is that each energy hatch can only draw 2A.
The buffers could output 16A, but the hatch it is connected to will only try to take 2A from each buffer. This is why you need 3 LV energy hatches to power the EBF initially, as you need 128 + 10% EU/t, which needs 5A of LV, which means you need 3 hatches. Two of them will drain at 2A, and the other will drain more slowly. It is always the same two that give 2A, so you can plan around this.
I was caught out by this, because I started off with 4 LV buffers, all full of batteries and 4LV turbines powering them. I had one buffer always running out of energy while the others were full. This is because the EBF was trying to take 2A from two of the buffers, but ignoring the others, and each buffer only had 1A feeding it. It all worked out if I just put one battery in each buffer, because then each buffer only drew and sent 1A.
A setup that will work is 3 battery buffers, each with 2 batteries going in to 3 LV energy hatches. You can then choose how you keep the batteries charged. Perhaps a layer of 16 battery buffers behind them. This will be well behaved, and stops the EBF from doing its best to run out of power.
EDIT: Also, electrolyse clay to aluminium, lithium and silicon (and sodium). Super powerful recipe. Also thaumcraft duplication of clay is super easy.