From looking at your gear you are lacking crit and are abit heavy on mastery.
Talents for single target:
lvl 15:Roaring blaze
lvl 30:Reverse Entropy
lvl 45: whatever floats your boat
lvl 60:Eradication
lvl 75: whatever floats your boat
lvl 90: Service
lvl 100: Soul conduit or Channel domfire depending on own preferance, think last time i simmed CDF were giving me 2k more dps but is harder to get into the rotation so Soul conduit is a fine choice.
For your opener i suggest finding max distance or safe it and start at countdown 4 sec.
1.prepot (either wod or legion pot)
2. cast incinerate
3. cast incinerate
4. Immolate
5. conflag x 2
6. use doomguard or
lord of flames if bloodlust or timewarp is used.
7. use service imp
8. cast chaosbolt for eradication
9. dump all of your rift charges
then back to using chaosbolt, incinerate and conflag on cd to get shards and maintain uptime on immolate and eradication but never cap on shards double cast CB if possible.
Keep rifts on 0 or save a charge for when you will have to move so you still are doing shit while moving.
Keep service on cd and doomguard aswell if you dont know that a BL/TW will coming soon then save it for that.
Thats how ive been doing it and my single dmg seems to be very good