The times I have used the stopper are for attempting a deadman and I pulled it in as close to take off aas possible. What you need to be aware of is that when you land you sheet in to get a soft landing but you probably use the sheeting and depower range to ride off with control - if you don't have a push away stopper then get ready to land with much more power than normal. This made for a quite a few faceplants and superman style splashdowns
Now if I'm doing a board-off I generally hold the bar in with one hand close to or straddling the centreline - give a bit more control and if you have to ditchthe borad or are goign to land badly then you can regain control quicker.
I have never used one but I would consider a micro-loop quite dodgy on smaller kites - even on my 11m C kite I could see how a microloop could get you in the shit - they are maybe the domain of bigger kites lighter winds?