Having been playing IC2 without any other mods installed, I find using glass fibre cables too inefficient.
In my humble opinion giving only one glass fibre per 2 energium and a silver dust is too expensive. Having such low energy loss, glass fibre looks like it is meant for long distance travels but all those good attributes are nullified by its atrocious recipe. What would be the point of having 0.025 loss per block when it is even difficult to craft a few tens of them?
I think the game will be much more interesting if crafting glass fibre gave 16 cables like it used to be in the past. I suggest a change.