Exercise caution with IC2 power when it comes to splitting the power flow. It doesn't always split nice and evenly. Most of those machines can be powered from a line after a Low Voltage Transformer, and that will save you EU in the long run by sending more and smaller packets.
Also, mass fabs suck a lot of power, so they can divert from other machines. A separate source or possibly a redstone connection to the MFSU to keep it from feeding power down that line unless it's partially full already would probably fix your problem.