your first that snapped the leader was the fish got the leader caught on the back of the trebles. Put a little epoxy in the V of your trebles. second problem, use at least 40# line between your dipsey and your flasher. what kind of reel are you using and when was the drag last serviced? When i first started fish ontario i used cheap swivels. line twist kills your mono, use quality swivels. they cost about a buck a piece but a new flasher and fly cost a lot more.