With no further work, my thinking is changing on this. When I had detail stripped and polished the action, the disco had some steel 'overmolded' on the top. I polished and smoothed this area pretty well, but some extra steel is still there. This runs UNDER the sear cage throughout the DA pull. It is much smoother now, but bumpy.
Therefore, when the disco/trigger set comes in from CGW, I intend only to polish the bottom of the sear again (moderately), and let it be and reassemble. I think the bumpiness WILL go away and the grit always was the overmolded part.