So i stumbled on this video and i liked how it sets simple guidelines for a power system to work. this video is oriented towards hard power systems tho.
For the folks that are too busy/tired/whatever to watch the whole video, here's a summary:
Consistency: you need to stick to your rules.
Clarity: readers need to understand your rules.
Competition: making the interaction between the powers and users interesting.
What are your thoughts on these guidelines?, have you applied them?.
Personally i think they can work as a world building tool to help with immersion in your story and these guidelines help to avoid overthinking about it.