I would avoid Swiftcasting in general while Ley Lines is up just because of the way the time tends to work out there. Besides, holding Swiftcast for emergency Blizzard 4s is usually more helpful especially in movement heavy fights.

I like Raging Strikes after Fire 3 just because Fire 3 takes a long time to cast... that's a lot of wasted Raging Strikes time for not a lot of extra damage since at that point you don't have AF3 active. If Enochian is cooperating, I do like to Convert while under Raging Strikes to keep my fire phase going a little longer.. but not if it means losing Enochian to do it.