Are my products compatible with Epiduo? Should I add anything?

I've been using Epiduo for two months now, and I'm just seeing the end infamous "purge" (I hope!). I've added a vitamin C serum as I've read online that it's great with Benzoyl Peroxide, but I'm wondering if there is anything I can do to help the process.

My skin is combination-oily and I've been breaking out on my chin and cheeks for a couple of years now.