False, all of the mod sets work with Stasis, but require some stasis related mods to work (obviously). Wellmaker isn't the only thing that works with Stasis
What do you mean by only Well mods work? Charged with light will still stack and apply normally to Darkness abilities (heavy handed, energy converter, etc) and warmind mods need you to use Warmind weapons. I am aware I may be misunderstanding you.