Chances are the chips are not clearing.
+1 on the coolant. Try doing a full retract pecking (so that the chips get brought out and the coolant gets in) and keeping the peck depth between 2/3 and 1/2 the bit diameter (so that not too much accumulates). Once it is all working reliably you can try to squeeze some time back. The RPM and IPM seem to be okay, if anything I would bump the RPM to 1660 (70 sfpm).
Good luck!
