If you want to make this competitive there’s a lot I would change.
1st, the airwing should probably be black heart so you can use AoV,, get 6+++ etc.
2, you have no transports for wracks which just feels wrong.
3, your scourge are probably equipped with the 2nd to worst option, if you want the anti tank, switch them all to blasters which saves you 36 points there alone.
4, heat lances on reavers? Heat lance should never be taken as it’s roll is questionable, they are better off being naked.
5, if you’re running prophets take urien for the love of god, he makes those talos so nasty, if you don’t, you’re wrong..
6. It seems like you want staying power and speed but this just doesn’t seem to hit the mark,. I’d take the required 3, 5 man wrack squads for your battalion then put the rest into more grotesques/talos.
7, 2x3 reavers is not going to do the job you’re wanting it to, there’s just not enough there.
8. You need redundancy
Hope that helps