The few times I've done it I'll always take back a move that wasn't the best if I find myself favoring one side. It makes you work hard at finding the objectively best moves or plan you can because your opponent always knows your plan and can't be fooled.
If a tactics comes up I genuinely didn't see I go ahead and play it, and sometimes it leads to interesting unbalanced endgames.
Do you think you can actually improve your game by playing against yourself?
It hasn't helped me at all. I've never once managed to beat myself.
--Cystem