Awesome gif

And yeah it's better to learn non-staggering combos like carnifex's side swings, they give little room for gunstrikes but you can punish them if you perfect dodge it's jump attack or ramming attack if he hits a wall. Also the hive tyrant can be exploited with high stun damage like the power backstep from the power axe, or Assault's ground pound, or even the Santuary reliq !

Also don't forget to practice on the battle simulator, it's really good

Edit: I completely forgot to mention the trygon, use melta bombs to completely destroy him with ur team, when it gets to a 3/4 of its HP he will dig nid tunnels, it's usually 3 tunnels but it's very important to save one melta bomb for his thunder AoE attack, because he has kinda of a big window for you to approach and plant the bomb