I think that this is your answer.
You should participate in the ECs that make sense for you. I would not worry about what admissions is going to think. If you do what is right for you, and make sure to apply to safeties that you would be happy to attend, then I think that you will be fine.
I also think that you should not over-commit yourself. You do want to have the energy left to do well in classes and the time to get some relaxation and enough sleep.