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1 sec/layer would effectively disable the cool feature. (There's no way for a layer to take less than a second to complete) You want to bump it up so that it takes at least x seconds to finish a layer so it has time to cool before you put the next layer on it. I have mine set to 15 seconds. The MK4 can't slow-down the extrusion so you'll have to orbit. A stepper extruder slows down the extruder and feed rate so print it out perfectly. (Or as nearly as we can at this time) I recommend a stepper upgrade. Printed or otherwise. :)