Thanks a lot for the quick answer, and for your addon too, ofc ! About the concern whether or not we should refresh it, I have to say I never really went deep into it, but when I played my warlock some time ago, I read on some forum that I had to refresh dots before the last tick (and after the penultimate, ofc).
And I think I read something like "Living bomb = you let it finish, Frost = you cast it on cd and nether = you cast it again before the last", but can't remember where (some post of swizzle maybe, or some other mage in here)