Hey guys, decided I cant beat marines, so ill join em

First attempt at a competitive space marine list, let me know what you think!! The idea is to overwhelm the opponent with bolter fire, threat dilution while also protecting myself from an alphastrike. The local tourney scene is moving towards 2250 for the moment, so Im going to take advantage of this!
Raven Battalion
Lias Issandon
Chaplain Ven Dred w/ Twin lascannon,
SB
3x scout squads w/ boltguns
Company Ancient w/ SotEA
10x Sternguard Vets w/ special issue boltguns
2x
Dev squads w/ cherub, 2x lascannons, 2 missile launchers
1x Rapier carrier with quad launcher
Astra Militarum patrol
1x Lord commissar
30x Conscripts
Raven Guard Vanguard
Kayvaan Shrike
12x Aggressors with boltstorm guantlets
5x Vanguard Vets w/
TH&
SS, Jump Packs
So I SFTS the aggressor squads and can combat squad them if needed, giving me flexibility where they go depending on who goes first/opponent's army. Ideally I want them 18" away from the front lines, so they still get the -1 to hit, but can put out max damage. Lias holds himself, the 2
dev squads and the sternguard in
DS, Kayvaan and the vanguard vets are in
DS. The chaplain cant be targeted, and is hiding behind the conscript screen with the rapier and ancient. The scouts deploy midfield on objectives/cover.
My turn 1, Kayvaan and the vanguard come down, next to the aggressors who are hopefully 18" away, so the aggressors can put out 227 hits with average rolls, rerolling to hit, which mathhammers out to roughly 201 hits landed. Kayvaan's warlord trait is he cannot be overwatched, so the next turn he moves up with the vets/aggressors, and everything charges in with powerfists/
TH. He also allows the vanguard to reroll their charge.
At the same time, the
dev squads and Lias deploy behind the conscript screen, and everything opens up on whatever needs to be, rerolling all misses. Finally, the sternguard deploy aswell, anywhere on the board where necessary, guaranteeing rapidfire range. So being within 15" means they put out 20 S4
ap-2 shots, and I can burn a
CP to give them +1 to wound.
I have a stupid amount of dakka, can deal with hordes with ease (looking at you
IG 
), can deal with tank spam, is
MSU to a point so fairly immune to lascannons etc and I hope my beta strike is powerful enough to take out the big threats before they do work to me. I can deploy defensively and turtle quite well, have good
CC threats and answers to enemies
CC.
What do you guys think? What am I lacking, what am I vulnerable to?