"The reason low rated rounds are dropped is to prevent intentional bagging"
actually ithink it may sometimes have the opposite effect. Player H is shooting poorly so he gives up knowing that if he shoots bad enough it won't affect his rating.
Or player J is inconsistent and sometimes shoots very poorly, but those rounds aren't reflected in his rating giving him a higher average than he is due.
seems to me, that ALL rounds should be included in a rating since you have no idea if they are legitimate or not. A round should only be excluded if it is not completed.