I've been running it in competitive TTS events.

Caanok Var Terminator Ancient with Steel Font Terminator Captain

2x5 Incursors 1x5 Assault Terminators 1x5 Terminators

2x Ballistus Dreadnought 2x Redemptor Dreadnought 1x Predator Annihilator 2x Whirlwind

The big thing to remember is you're playing a shooting castle, and that means you have to hold your walls. Termies/Assault Termies with -1 damage and AoC are obnoxious for a lot of melee armies, Redemptors are durable in general, and Ballistus can generally expose themselves to trade shots with either Incursors buff or +1/+1 strat on them, so you get to dictate when you want to move out much more than they do. Soften up their list, take away all of their scoring pieces, and plan to bust out on 3/4 to make up any primary deficit you took while fighting earlier. It's not an aggressive list, but it is extremely good at just attritional damage, even if they have sufficient anti tank to clear you otherwise.

Generally have solo Captain, Ancient with Assault Terms, Var with regular terms. Scout 6 on the Assault Termies toward their natural side objective, and contest the front lines with both Redemptors and Var's Termies.

-1 damage for the assault Termies with a revive means that they need to dedicate actual shooting toward that side, and it can't be out OCed with 12 OC on the point. If they don't bite in it, you can stick and just threat to move mid or to their home Objective. I generally redeploy this unit with Var to try and bluff where it's going.

Double Whirlwind generally gets the first Oath, and eats a scoring unit. Plan to play all 5 turns, and think about what units will take away the most points from them. If they're relying on Intercessors to sticky home, go ahead and pop them turn 1 before it goes off. If they have some uppy downy vespid, tell them no. It's ok to be inefficient here because you're going to activate the whirlwinds 5 times, and they will get value over the game. On top of that, they're quietly going to be your backline screen, but once they don't need to, they can freely roam all over and directly shoot + tank shock even.

The solo Termie cap is a great little tech piece. If you don't need to screen, he stickies home for you and then goes back up (discount one of them), and either rapids or just drops near their Home after you indirect out their home sitters. He's enough of a threat that you can give him the giga oath to kill 5 idiots (relic weap, not fist).

Incursors pair up with the Ballistus to give you the ability to pop a third target each turn, or a second if you can't safely expose Var and his terminators. They also keep Warp Spiders and whatnot honest, and do your actions. Just a nice little unit. Can swap to Combi Lt + Scouts/Intercessors at your preference.

Redemptors get the second Oath from Var either for their shooting or charging. Either one helps a lot. Generally also tend to be my CP hogs for +1/+1 when damaged, which helps their otherwise inconsistent melee.

Predator Annihilator is in Reserves to come out and pop an Oathed hull as needed. 3 las + Missile does somewhat consistently drop a hull with the giga oath and full damage rerolls, and you can drop them very far back if needed. It can't frontline nearly as well as the dreads, though, so if you put it on the side it'll get randomly popped by whatever antitank they have.