You could make an unkillable team with Maneater and Pain Keeper (see https://www.deadwoodjedi.com/speed-tunes-4/New-Budget-Maneater---3-Bosses%2C-1-Comp ). Then you can also forget about decrease attack, healing, increase defense, revive etc. Although it does take a lot of gear tinkering and stat tinkering - and even now, I still have trouble if the CB crits on ME or PK in the opening round, throwing off the entire run.
Then you have Ma'Shalled who you're not using - he boosts the speed and crit damage of the entire team, plus he puts a leech, which may allow you to lose the lifesteal / have less support champions.
Lastly, Zavia shouldn't be used on CB, or at least not if you ever auto it, because her A3 will do much less damage than if you just let those poisons tick instead. And even if you only manual it and make sure never to use the A3, isn't it poison overkill with both her and FB?