Only one question. How do you keep the shaft cores magnetized? With a redstone clock set to a .25 second pulse(the fastest a PR timer goes) they seemed to charge slower than they ran out. I had 8 steam engines geared to feed a single magnetizing unit and even with them nonstop running and my AC engines only for on demand use, I regularly had no shaft cores to run the engine. It honestly felt easier to build a canola and ethanol setup than to try and keep shaft cores magnetized. I never understood the point of them losing their charge. Real electric engines don't.
I just remove the shaft core and recharge it. It's slow as hell, but it still gets recharged.