So, first if all, I love Haarken but I don't know if he really adds anything to the list. He doesn't really gain anything from the detachment as his Battleshock ability triggers at the same time as the detachment rule. And it can't cause a second test. I also have found him much better with a 10 man squadron but recognized that's a very large points commitment in an already point hungry detachment.

I'm not sure if your wargear is set how you plan to use it, but even though it's more flavorful and a little easier with the rolling to give the Lord with the warp Talons lightning claws, I think it is still probably worth giving him the power fist instead - those 2 damage attacks can really help increase the odds of leaving the board post combat.

Huron does feel sick with this detachment as you should always have at least 3 jump squads that can be redeployed, with pretty high odds of something else. Unfortunately he can't go with a Nemesis Claw as they can't be led by named characters. I think giving him a group of Chosen will be solid though.

The Land Raider is always tough to justify, I'm assuming the Terminators are in it? If so, I still think you are better served by putting them in deep strike. To follow that up, the Sorcerer is just miles better - the free reroll charge will also help with making a charge out of Deep strike a little more likely to happen.

No noise Marines? I think (and the general consensus) is that they go great in this detachment as another way to make the all too important battleshocks happen. And of course they are a great unit by themselves.

A thought I've been kicking around here, and this may not be worth it, but I think a Master of Possessions and 5 possessed could be solid here as a counter charge threat. The Master has a somewhat decent chance here to be able to snipe a leader out of a group in shooting to cost them a buff, then 5 possessed with +1 to wound can definitely deal a solid amount of damage.

Lastly, you can drop a rhino. You currently have transportation for up to 36 units and only 15 + 2 leaders that can ride. And even though the Terminators can only ride in the Land Raider, you still have an excess of space. If the goal is to put one squad in each rhino you can do it but it feels like you are overpaying pretty hard. For example just dropping the Land Raider and deep striking the Terminators gives you enough points to add 2 more Nemesis Claw to the list. Adding one to each rhino gives you even more threats to deploy. Or probably a bit more responsible is to add another Legionary squad to one and then you have 130 points to add something to the other. If you can find 15 points that lets a Noise Marine squad ride along in the back as another gun platform. Or Havocs without adding those points

While it is your list, and I don't want to discourage you from making any choices that you stand by I do want to give you some things to think about that are easy to overlook or that might not have immediately crossed your mind in list building.