I think your team is balanced, your GS is good, you know how to manage enthusiasm...I don't think I can tell you anything you don't already know
Yes, for the last league game I'd try outside attack to see how it goes against Quimica. Even if you lose, there's no harm because you can't lose first place anymore. I'd try Motion because you have decent Offensive Flow and Qimica doesn't have very good defense, and you will also mitigate their RnG with slowing down the pace.