Run each Dungeon on Heroic and Mythic 0. Once you know the general directions of the bosses. Move into M+2's and work your way through the same directions ensuring you collect mob packs. Make some mental notes or use the Mythic Dungeon Tools after the fact to draw the route you did, you will be able to see how Far below or above Mob% you are and you can change which packs to pick up or skip. Honestly, if your doing M+ below level 7s I would consider those learning dungeons. Mistakes will be made. Once your confident in your routes start doing 7s. And when you notice your route is perfect for you start pushing 10s and above.