Display More1. Sorry, I just meant insulated copper cable, that shouldn't be relevant though.
2. I didn't expect the order of output sides picked to effect the amount outputted, but it appears that it is.
Edit: Strangely enough, deleting everything then resetting it in the exact same configuration fixed the problem, with each outputting exactly 256 eu/t at 32 per packet. Strange.
Edit 2: Realized in original setup that one output has one cable then an mfsu, then the other has two. Setting new setup to this revealed same outcome. Is this intended, that EU split between outputs is determined by cable length?
Thanks for the screenshots. It's not anything intentional on our part, at least. We currently have no way to control which output faces the transformer emits energy from or how much goes where. What you're seeing is most likely an artifact of either the order in which Minecraft updates tile entities or of the way the IC2 energy network decides where to route EU packets.
For regulating power to evenly distribute between multiple destinations (or to force uneven distribution), you'd want to use one adjustable transformer per destination, with the transfer rate of each one set to the amount of EU you want going to that destination every tick. With multiple outputs from one transformer, there's no guarantee that energy will go where you expect, although as you've shown, it's possible to find configurations which generally behave in a desirable manner.