Asking for nitpicking on destruction reforging/rotation help.

Hi. My alt is a warlock, but he's definitely my most favorite character to DPS on. So when I DPS on him, it feels like I'm not doing so well. I read the sticky at the top of the forum but I'm still pretty confused/feel like I'm doing something wrong. Mainly, I'm super confused over how to handle ember charges. When I should REALLY be prioritizing chaos bolt. When I should be using shadowburn/dark soul. Stuff like that. Also, I'm unable to keep rain of fire up 100% of the time because I end up running out of mana still fairly quickly from incinerate spamming(Even with backdraft).

If anyone can give me some advice, or poke at my reforging/gemming. That'd be awesome. http://us.battle.net/wow/en/characte...Sagment/simple < armory link. Any help appreciated, thanks.