A lower temp fuse is the way to go and it prevents the insulation in the fan motor windings from burning and causing a short. If you have a Kill-a-watt or AC amp meter you could measure the stall current of the motor to see how many amps it draws for the amps but the 2 to 2.5 amp increase is not a problem. By all means use some better oil in the fan bushings too like synthetic.
Linear Mode
