Your stats are looking great! I'm not sure about if there are some rewards for changing the "main card", but as nowhere is stated, I would say that it's not relevant... Maybe when you create whole band, but tbh, I have no idea... lol...

Regarding your strategy, the most important is to use energy 100%... The idea is to use high consuming missions when we can't play the game for a longer time... at least, that's my idea... lol... Everyone has different free time for playing, so we all adapt as it suits to ourselves...

I have bought cold pizza slices, so I have backup energy to play during the day, but as I can see, it will not be needed as missions lasts longer when you are higher level...

Thanks for the comment and screenshots! Appreciate it!