Magamoto 2020 gambler tire choice

Hi guys. I'm building my mega max 212 for the gambler next year. I'm looking to upgrade from the stock tires because they have no grip. I would like to go a little bigger also, I'm thinking I can fit 21×7-8's with relative ease.

I'm thinking these in 20×7 for the front

And these in 21×7 for the rear

Anyone who has done the gambler on a megamoto what tires have you had success with?
I've looked at those, I just want to go with a little bit bigger tire if possible and they only make them in 19×7-8. I've got a stage 1 tillotson 212 with a comet TAV-2, so with proper gearing the added rollout shouldn't be a problem...