just make sure the dots are right on the two IV transformers, at the power source for upconvert the big dot should be facing downstream, facing the transmission cable. at the end point for downconvert it should also point towards the transmission cable after whacking it with the soft hammer. i always have to think for a long time before placing them, and somehow i always seem to get it wrong anyways. LOL so take my words with a touch of caution.
i'm right at the same point as you, was disappointed there's no cable with 1 amp loss per meter at the power tiers like LuV and ZPM, but i guess that's expected and maybe realistic. Superconducting cable, but that's gotta be ridic expensive.
I also wonder why we can't have ZPM batteries, since the graphic is already in the pack. The whole thing about "you can only find the battery in a random chest and you can't recharge it" is kinda weak if you ask me. But who's asking me?

Get on that, BloodAsp, m'kay?
P.S. I played the modpack on SMP server, and heard a rumor that a ZPM had been found by someone... first thing I did when I obtained the world to play on my own in SSP was make the long trek to the guy's base and find that that mythical ZPM battery of his. hehe