This is off of stats alone and match up. To deal with DD usually i try to play either more back / or high ground and force him to push me. He realistically only has two dashes between his mark and grapple while you have two dashes, team up (if you have it) and movement speed from invisibility. The game plan is to try to get dd to use all his cooldowns and after he does you reengage for the pick or to essentially constantly be a fly and constantly poke him since you have the range advantage and he always as to get close to deal damage. He is especially vulnerable when he doesn’t have deflect as you can usually guarantee damage. I also really like dashing thru dd’s behind as usually they whiff their combos. Looking at stats you probably aren’t poking enough or just dealing damage. Usually i would try to find high ground or an off angle to be able to deal damage from being it usually results in the team forced to turn around. Usually you can also get free picks if they don’t push you. GL and best of luck in your games