I think the EU loss on fibre is incorrectly set (or the wiki is outdated) I'm currently experiencing loss off 1EU per 40 fibre cables (which would make the loss 0.025 instead of the documented 0.05). 40 blocks would probably make fibre a tiny bit too awesome though I'll leave that for you to decide.
Also, though I don't know if this is a bug, I seem to be able to transport currents higher then the rated amount through a cable. I attached a dozen or so MFSU's to some fibre cabling all converging to another MFSU. The EU-reader reported a EU/t of around 20k EU/t. I assume that this means it's not the sum of the EU/t that matters but the size of the individual pulses. Some clarification would be handy.
Some screen-shots to clarify:
http://0x7f.nl/minecraft/eufibre.png
http://0x7f.nl/minecraft/maxrange.png
Cheers,
Ginji