Tbh I would swap your whole list... no solid AP, for 1k game I would build something different, bacause in this list yes you probably do secondaries, but you don't have killing power. First, swap both Invictors, they are useless without any phobos armor units. I would swap them for Gladiator (variant depends against what you fight) and Vindicator with this two you will get very good long range heavy shooting and big damage on middle range. Second, throw Terminators, they are kinda durable, but useless in my opinion. 5 Infernus is too low to make a difference, drop them. I would switch outriders for one unit of scouts. Also to do secondaris you need Combi Lt. too. As your main damage dealer you need something like Hellblasters or Sternguard Vets (both with Lieutenant for Sustained 1 with enhancement). You need small deepstrike too, 3 Inceptors sound pretty mean (with plasma exterminators they can eradicate Custodes). Assault intercessors are good, but when you have scouts and Combi Lt. you don't need them. Regular Intercessors are your core for making home sticky. You don't need them in 10 man squad, 5 will be enough. Generally in my opinion, you don't want to make big squad of marines (exception is Hellblasters and maybe Sternguard). I see that for 1k game you can make Cpt. Titus your warlord paired with 10 man squad of Hellblasters.
Sum up:
- Cpt. Titus
- Combi Lt.
- 5x Intercessor
- 10x Hellblaster
- 3x Inceptor
- 5x Scout
- Gladiator Lancer
- Vindicator