So i have a tournament comming up consisting of me and a few friends so an in house tournament

But any advice would be appreciated
I will list what i am currently thinking on taking and what i know im up against also we all agreed to not hold back so im trying to be
TFG
What im up against Orks, Tyranids, Necrons
What I have in mind:
Company Command Squad - 150
Master Of Ordinance
Heavy Team - Lascannon
Chimera
Lord Commissar (Bruce Lee) - 100
x2 powerfists
Infantry Platoon 160
one autocannon team per squad
Infantry Platoon 160
one autocannon team per squad
Infantry Platoon 160
one autocannon team per squad
Infantry Platoon 160
one autocannon team per squad
Vendetta - 140
sponson heavy bolters
Vendetta - 140
sponson heavy bolters
Leman Russ vanilla - 150
Leman Russ vanilla - 150
x2 Hydra - 150
Ratlings x5 -50
Ratlings x5 -50
Ratlings x5 -50
Right now at 1770 (Army Builder covers my poor math skills

) that said what else should i change?
Also the commissar bruce lee has fists of fury and i cannot tell you how many times this guy has served me well kind of a goodluck charm
The tactic is simple stay back abit and shoot to cripple them before advancing the vendettas are there to attract a stupid amount of firepower
the hydras are incase of any fliers i find to be a threat and the ratlings will pin down as many squads as they can or annoy the enemy enough
for them to be a distraction I know many people are gonna say needs moar chimeras bro i dunno its just my playstyle any advice is welcome though
Quick edit i know its not 1850 also asking abit of what to add

im abit stumped right now