Generally you want a good stun rotation and then start rotating your tank/healing CDs if necessary. For your comp you could shockwave into binding shot cover or something like that. Using binding shot and placing an ursol's vortex, then typhooning the mobs to move them to trigger stun + drag them back into the stack is a good option as well if you won't pull more mobs.

Make sure people are using cooldowns accordingly. If there's 3 mins of trash before a boss, you guys better be using your 3 minutes and pull more to get good use of them. Pre pot all the time and combat pot when applicable (usually only last boss). Make sure you don't put your potion on CD before a section you have to invis.

Try to get better gear for your set, you want to ideally have everything with your best secondaries on them, like haste/mastery for shaman. For dps trinkets you want decent proccing ones and a good on use, the PvP proc trinkets with versatility are better than a lot of raid ones because it's main stat. Avoid dungeon proc trinkets, they're undervalued for their ilvl. Tanks want static mastery/ba proc or static ba/proc mastery trinkets.

For your hunter: "recently" people discovered the glyph of mirrored blades works on a lot of abilities in dungeons and it will completely cheese a lot of mechanics. The glyph makes your deterrence reflect spells and spell effects. Here's a list of spells you can use this on, some are better than others: Click me and then click the grounding totem tab. You may want to practice with this in heroic/mythic first, as it will likely get you killed if you mess up. It'll save you a lot of time if done right.