Don't know if this helps much but I watched a couple of Direwolf20's latest SMP videos and they seem to have IC2 working O.K. with Mystcraft in SMP. Now, it is a game of mostly mod. authors (which is why I've watched some) so they are likely running custom versions, but if you can get one of them to reply, they might have some suggestions. IIRC Player is an IC2 developer playing in that game.
Bandos81: You list RP2; Will a BlockBreaker break your MSFU free?
You could try powering your miner with a compact solar. Of course it would only run during daylight hours. Personally, I still wish the IC2 Miner would run off a Lapitron crystal.