Max level avoiding too hard MMR

Hi, I have 3 five stars and I would like to know what is the max level I can reach before MMR starting throw me in hard battles?
Actually my roster is:

Old Man Logan lv 345(331)
Jessica Jones lv 300(143)
Silver Surfer lv 345(231)

Thanks.

It really depends on the rest of your roster. If you have champed 4-stars you should be safe and you’d want to cap your 5-stars around the level of your 4-stars when they are boosted.

If you are a 2-star player you’re already screwed. I’m guessing that’s not the case.

I agree with Dormammu. I’ll be doing the same thing until I have a good set to champ.