I checked your map, i loved the way you stacked all reactor and your mox design but you use a lot of redstone which as you said can cause lags and i don't find it a good way to automate ic2 stuff .
Redstone dust itself doesn't cause a lot of lag, it's turning it on/off that cause lag due to the tremendous amount of block updates that it cause. For the machine part, I have tried to optimize the lag when it's idle wit the help of LagGoggles.
I modified a bit my design, now i'm using a weighted item distributor to send iron plates in priority to canning machine then batch crafter, it makes a buffer of 128 iron plates but for now it's working but i wish the sorting machines would be able to also sort quantity (i'll make report on mantis, in case it's a bug).
I think it is better for you to make a thread in the suggestions forum, since this is more like a feature request/suggestion than a bug.
For your EU issue, i know the splitter cables doesn't work, you still can use 2 transformers to achieve the same goal but beware of wrong wiring (RIP my old mining factory, only 1 machine wrongly wired on 2048 instead of 512 destroyed the entire building ).
Since my map has 20 reactor in it and each generates about 600 EU, I don't think that a few transformers will work because of the extremely high amperage (and it will be bigger if more reactors are put in there).