The funny thing in hair loss topicals is that you can pretty much apply whatever you want, however you want. If 1 application once a day is giving you acceptable results BY ALL MEANS keep it up. In fact, that's really a good thing. In the event (knock on wood) that the 15% application isn't enough to retain your results, you can always add something else. It's kinda hard to add things if you already are using EVERYTHING.
I just ordered myself up a batch of Xandrox15 for the morning. If this doesn't work, I'm screwed. Already using all the heavy hitters, Dutasteride, minoxidil 5%, and soon Xandrox15. Alls that's left is spironolactone at night, and that sh*t makes me wanna vomit.