Fin Cogneato

I've just gotten to the point where I have a decent team and can start competing in Leagues. My stats seem to be on par with xRob91 but I'm obviously missing some key aspect of strategy. I tend to top out around 2-4 but never can secure a 1st place. Is Attack Power not as important in League play? I see a lot of teams that seem to value Ego more. Do you all keep separate Purple/White teams optimized for fighting against the Black/Red teams? Any tips would be greatly appreciated.