stick to one element, likely water considering you said you have a lot of water SR... if you're gonna work on other teams (you should later), stick to one element on them (eventually having 6 teams, all a different element)
same element teams allow you to do this level of damage easy:
and it only gets better with a stronger grid, cause I only have 2% base assault from pride, 40% HP (don't need that much), and 54.5% assault
mind you, this is enough damage to one-shot ultimate normal enemies basically