Removed blade head and moving blade to find that it had been ground at an angle. Reground high side of blade square and also reduced size of hardened spacer in my mill using a conical grindstone - it was very hard. Reduced blade clearance to 0.1mm.
The difference in performance was astonishing, and these corrections have dramatically improved the tool, which now cuts in the direction you tell it too, and does not jam up on the kerf.
Best Regards
picclock