In timed events, use Swipe and Stop. Make a match, make a mistake (stops the clock), do the specials, then when the board lights up, do Swipe and Stop. Many more shots, more uses of specials, more damage. You go from 4 shots a 20 second timed game, to 15+ shots in 20 seconds.
Recently timed on my tablet 19.38 seconds for my first shot, and .48 seconds for a single shot. Practice it in regular dungeons.