Thanks, these are all helpful guidance. I did find JOSM and have tried it for a few changes and uploads. My experience so far is that it's deeply unintuitive so the learning curve is definitely steep. I'll spend more time learning it when I'm back from current business travel in Europe. It's also clear that having some patience to tune and get the features right, put enough points in the polygons to avoid overlaps and have decent curve following, is all valuable. Rushing to the  finish line clearly generates QA issues... sorry 'bout that. I'm learning :)  Meantime I'm just making small edits and corrections where I can as I can in ID. 