I thought you were the big whale of your server. Why would you need advise for something so easy, sensei?
Fuck, you beat me to it...
But I will give you my team... not sure if my lowly peasant team will do though... it might not be upto your standards.
Zem (awakening mandatory), Vernos (awakening mandatory), Sylphi, Garrick, Lingling
Protips from the pauper:
Do not ultimate YOUR Vernos before the enemy Vernos has put his pumpkin bomb on your frontline between your Vernos and Zem. Only after that ultimate your Vernos. If you use your Vernos earlier then the enemy Vernos puts his pumpkin bomb in your backline and your Sylphi and Garrick will take a trip to the middle of the screen between the enemy plants and 95% of the time they will DIE!
Zem will usually take A LOT of early game damage and keeping him alive requires timing, so the moment lingling has an ultimate ready, you combine her and his.
This means that while Zem is transforming the game actually "pauses" but your Lingling ultimate will continue and it should be ready a fraction of a second later then Zem's ultimate. This means that enemies can't attack Zem during the time you bubble him and thus he will survive the early game and from here on it is easy pickings. (((Sometimes Lingling will throw food to the frontline and heal Zem and vernos making the timing less strict but that is a 2:5 chance)))
Use the 1st Garrick ultimate not mindlessly straight away but use it when a new line of plants spawn. He will debuff them with his ultimate and best case scenario it will be energy bonus. His 2nd ultimate should be combined with Lingling in order to maxmise DPS. It is up to you to find out when this is, but in general later is better due to the boss being on lower health.
Alternate teams (Not the best)
Octo (awakening mandatory), Vernos (awakening mandatory), Sylphi, Garrick, Lingling
Octo (awakening mandatory), Vernos (awakenign mandatory), Vulko, Sylphi, Lingling
Same protips apply with alternate teams where able.
EDIT: added a screenshot from our top 3 damage. Mighty minions and More dps are my accounts on those servers so as you can see I use those teams myself. I am also pretty sure I can do 14m++ but my scores are with the boss between 12%-18% after damage calculation.