As the others have said it's your wargear which is causing problems. Units like
CCS and
PCS should max special weapons and have nothing else except maybe a vox caster, speaking on the subject of orders Creed would make this army rock.
Your Chimeras aren't going to last too long. You've got two av14 tanks which will attract melta and the three Chimeras and that's it, not a huge lot of armour. No I haven't forgot about the Sentinels which like everything else have the wrong wargear making them overcosted.
Here's a better list but this one is pure foot:
HQ
Company Command Squad - Lord Castellean Creed, autocannon
Lord Commissar
Troops
Platoon Command Squad - 4 x flamers
Infantry Squad w/ Commissar - autocannon - sgt w/ power weapon - Commissar w/ power weapon
Infantry Squad w/ Commissar - autocannon - sgt w/ power weapon - Commissar w/ power weapon
3 x Heavy Weapons Team - 3 x lascannons
Platoon Command Squad - 4 x flamers
Infantry Squad w/ Commissar - autocannon - sgt w/ power weapon - Commissar w/ power weapon
Infantry Squad w/ Commissar - autocannon - sgt w/ power weapon - Commissar w/ power weapon
3 x Heavy Weapons Team - 3 x lascannons
Platoon Command Squad - 4 x flamers
Infantry Squad w/ Commissar - autocannon - sgt w/ power weapon - Commissar w/ power weapon
Infantry Squad w/ Commissar - autocannon - sgt w/ power weapon - Commissar w/ power weapon
3 x Heavy Weapons Team - 3 x lascannons
Fast Attack
Sentinel - autocannon
Sentinel - autocannon
Sentinel - autocannon
Heavy Support
Manticore Rocket Launcher
Manticore Rocket Launcher
Manticore Rocket Launcher
Creed gives orders for what you need, he has 24" order radius and can issue 4 orders per turn plus a few unqiue ones. Lord Commissar keeps the
HWT teams in check with his stubborn bubble, he attaches to one so he doesn't get picked out.
Infantry Squads bubble wrap the artillery and hide in terrain laying down mass autocannon shots supporting with lascannons.
Sentinels outflank to harass and get side armour shots, the opponent will have to deal with these or risk taking some damage which means less heat on your troops.
Manticore lay down the long range anti infantry and anti tank with the S10 blasts, on average you're looking at 6 large blasts a turn.
Total autocannon shots is 14 and total lascannon shots is 9, not a massive amount compared to some lists but better than what you have now.
If you do have points left consider Priests for furious charge counter charge goodness if anyone gets close.
Btw I haven't check points so you'll have to do that