I'm never sure if these issues are ATOM based or existed in the mods the parts came from. But this absolutely should not accept effeciency. Arguably shouldn't respond to beacons, though if it only respected broadcast speed it it probably okay.
It is very easy to get this thing going at -80% energy cost and +500% speed. In fairness, energy is rather meh, but still, this thing could create 1000s of % of free energy. The loop may even be closable with matter synthesis, though it would be a bit convoluted. Perhaps more to the point, it is easy to bring the factorio fluid system to its knees while running off a single fission powerplant.
I'd say lose the modules, but speed modules are actually an interesting problem to solve, as you have to be clever how you use them since heat flows with resistance, and you can't have your reactors an arbitrary distance from the machine.
