How loose should the strings be to remove the koma? If I make them really loose (easy to lift and slide the koma right out from under) then I spend quite a bit of time the next session getting them in-tune and then getting them to stay in-tune. 
If I try to keep some tension (about two whole-steps down from C-G-C), then the koma scrapes the skin and/or the strings as I try to remove it. 