I asked around on discord but I didn't get a solid answer. Unleash the Djinn states that it sets everyone's MIL and POL to 3/3, and they state that you can't increase it at all or reduce it. Is there a ruling stating whether set stats are static and cannot change?

Rules, p11, Modifiers:

Quote

When a value is “set” to a specific number, the set modifier overrides all non-set modifiers (including any new non-set modifiers that are added during the duration of the set value). If multiple set modifiers are in conflict, the most recently applied set modifier takes precedence.

Thanks that's what I was looking for.