It's already set so that you will only lose 1 stack and don't gain anouther so that you definitly lose one and don't keep the same amount at the end of the turn. That actually sounds like a pretty good idea, i will do that! Kitsune form is more of a passive form, all kitsune skills gained are stored in the normal skill menu where the transfomration skill also is located and can be used by any form. They are more like an universal tool or last resort depending on the situation and playstyle.