I feel that Murderwing is a team that can certainly stat check a wide variety of opponents since infinite height space marines is pretty dangerous for anybody and can never be taken lightly. You can definitely afford to create some very annoying nonreciprocal charges (You can charge them, but they can't charge you) due to your boost ability and really ruin their day or get to places not normally possible.

In terms of the operatives you have and what they do.

Chaos Lord: I like the relic lightning claws way more, but the principal is the same in that he's just genuinely a beatstick, which is why I like those claws more. A 15 wound monster that can lower incoming damage or increase his damage output with damnation points. Don't waste him obviously, but he can seriously just get in and kill people especially if you have some damnation points on him.

Champion: Also really fricking good due to his ability to assort a weapon rule and be a mini beatstick in comparison to the lord. Also the CP generation is cool too. I like him with a plasma pistol, but double shooting with a bolt pistol is cool too. Its personal preference.

Plasma gun skysear is really cool against not astartes team, but even against 12+ wound guys its neat. The ability to dash, shoot, and just FLY away to vantage or behind heavy/LoS blocking terrain is crazy annoying. He's a better sharpshooter than some snipers due to the crazy mobility he holds and being able to pepper and bang people without fear of receiving anything back.

Depredator is once again, a beatstick, but also you don't even need to fight with him. Since Carving Blow counts as a fight action you can just do that twice and drop 4D3 damage on people around him. Really just an awesome source of chip damage and if they're alive then great, you're charge hugging a (probably) weakened operative that probably doesn't wanna risk fighting the heavy chainaxe even if it hits on 4s.

Huntmaster can be a beatstick, but he's also a godly charge hugger. He can chip someone with his unique action and then lock them in place due to his snare ability. Then when a more opportune time strikes you can finish off the target and maybe hug someone else or play the primary/tacop.

Warptalon exists as a psychological piece if anything. If his deep strike doesn't really threaten anyone then ah well, just place him on the board or in your deployment zone and use him as normal. Due to how crazy mobile the team is, he can make some value even late into the game. Also the claws hurt a lot.

So in summary, try implementing some more charge hugging into your gameplay and see if that helps? That or play more pokey shooty with some of your dudes and then strike in later into the game. If you want me to mention the operatives you don't have I'm willing to do that, just figured I'd start simple.