[chryuop]

I thought they all just mean "end it completely".
In all my books they use different way to translate it "finish doing", "end up", "after all". <Completing an action according to the context expressing regret or contempt for it. ーしまおう show the will of doing the action, while the other forms above all in the past tense you can show actions non intentional or that create damage>.

This is summering up taken from all the books I have. I didn't know there is actually a distinction of the use. I thought they all just mean end completely (wanted or not wanted, happily or regrettingly).
Sorry Maxful for misleading you.