couple pointers that helped me:
1.) save your swiftcast for flare. you can usually hard cast t3 at the beginning of each phase before he gets into mechanics, and then use T1 when your in umbral ice
2.) every time you move, use scathe. this may take a fire spell off of your fire chain but...
3.) don't worry about losing a fire spell off of your fire chain. Unless you are 100% perfect and other dps in your pt are consistent, chances are you aren't going to finish your fire chains all the time due to jumps, goals, etc.
4.) your dps will increase when the jailers spawn. if you are parsing in real time, don't be discouraged.
5.) I usually use raging for my first fire chain, and then again after gaols in the heart phase. Save quelling for the egis. Also your 3rd raging and 2nd quelling should both be off of cooldown for the 2nd set of egis.
Hope that helps. Employing these tactics helped get me from 175ish dps to 235+ consistently.
