Currently level 32

My basic rotation:

1. Shadow Word: Pain
If I get stunned or nearly killed I use:
2. Power Word: Shield + Renew
3. Smite
If I survived the 2.5 cast time:
4. Penance
5. Mind Blast
6. Devouring Plague
7. Holy Fire

I’m all over the place with my rotation, anyone else use a more solid rotation?