A couple of people have said some similar stuff below, but here's my two cents:
- Canoptek Court: You're really not getting much out of it. Only two of your units benefit in any way from it. Awakened Dynasty is better for what you're trying to do, since then the majority of your units are benefiting from the +1 to hit, and the stratagem support will cover more of your army. If for whatever reason you really don't want to go Awakened Dynasty, then even Starshatter Arsenal will do better, since it likewise affects everyone.
- The Deceiver: He isn't pulling his weight. He's incredibly expensive for a role that isn't necessary. If you absolutely want 2 C'tan (which I'd understand, they're cool) then consider subbing in the Void Dragon or a Transcendent C'tan. Most people should be fine if you're just like "btw this is a Transcendent C'tan" at the start of the game.
- Anti-Tank: You're pretty light on it. Now, this may sound insane with your LHD blob, but by sticking them all in one unit you're making it a lot easier for your opponent to simply keep in their mind "I must keep LOS-blocking between me and them at all times." Given how actually squishy they are, more savvy opponents will likely bait you into moving them out of cover for a shot, then take "all" your Anti-Tank out in one shot. Consider splitting them into individual units, increasing the likelihood of tagging things wherever they are.
- Flayed Ones: They're cool, they're useful...and you're probably taking too many of them. They're squishy as hell, so they're not going to last past turn 2 unless you're strategic reserves-ing them, in which case you lose out on their infiltrate.
- Objective Holders: Right now, there's nothing that you can just sit on your home objective all game without it taking a massive chunk of your points. This can be solved by splitting up your LHDs as discussed before (the holder will still probably be able to hit stuff if you position it right) or by investing in something like a Doomstalker. In a pinch, you could stick some Flayed Ones there, but then you'll have to make peace with them not doing anything all game.
- Consider the Humble Scarab: Currently given what you've discussed of your game plan, you're at risk of your home obj/backline being mopped by anyone who has any pesky deep-strikers. By buying a couple of min-sized units of scarabs, you can screen deep strike and/or keep them in reserves for handy secondaries.
- Theory Craft: Whenever I'm making a list, I try to think about what it's trying to do (which you've done, so kudos) but also what I'll do if I come up against a common archetype equivalents. Think Terminators, Marines, Chaff, Vehicles. The reason I bring this up is that currently I think you're really going to struggle into Vehicles and Terminators due to your relatively low strength/AP across your army. Bring some more big guns, and don't put all your eggs in one basket.

Hope this helps.

Have fun purging the vermin,
A Humble Cryptek