Decrease balloon train time
As a town hall 9, there arent many strategies to trophy push with. Balloons and minoins are the best one in my opinion, and really the only strategy that can consistently win above 3000 trophies. To train just 20 balloons takes 40 minutes, which is a pretty long time for a single army. Because of this, many people are discouraged from using balloons, and therefore trophy pushing at town hall 9. Decreasing the balloon train time would encourage more people at town hall 9 and town hall 10 to trophy push, myself included. And since the majority of gem money comes from people trophy pushing, constantly boosting barracks and gemming things to completion, this could even make Supercell a little more money. Yes, it would cost 10 gems or so less to gem balloons to completion, but more people would buy gems to fund their trophy push if balloons didnt take so long to train.