Yes it is a bit strange as its a pocketing/cut out path which I was running after having done the two rectangle pockets. The idea being that the wider channel/pocket being cut would allow for chips to get thrown out.

Had my nerve held with the camera/phone, you would have seen it ploughing through more material once it got down to the level of the previous pockets, but I eventually ran out of patience and just went for a slotting cut-out and frantic brushing of sticky chips caught in the narrower slot.

I'll definitely being playing with some scrap to try some more aggressive strategies, as I agree the conservative approach seems not to be optimal.

More as I find time to play/work on it........