Next few weeks your skin will continue to dry out. You'll probably see more breakouts but after another few weeks you should see noticeable clearing. Just make sure you keep moisturizing. Your skin is probably going to be more sensitive throughout the course.
Hard to say because everyone is different. It may cause your skin to purge a little more than it is now but its more likely to clear up faster on a higher dose. I wouldnt worry about it too much because in the end youll clear up anyway! Good luck!
Well I would probably stick with BP morning and Differin night but you could mix them if you really wanted. Epiduo is a topical of differin and BP mixed together. Again you'd probably be better off morning and night though.