I think it's incorrect. I don't know why so many people think to open with B3 at full mana, it serves no purpose. If you had infinite mana, all you would do is cast F1 all day with firestarter procs, you want to maximize your fire time.

I think the lvl 50 rotation is: Swiftcast > F3 > F1 w/ firestarter until nearly OOM > B3 > T1/2 (not sure yet) > repeat
To people saying Convert is useless, I disagree. When you have bosses where you need to use flare clear a lot of adds quickly I like the following: Raging Strikes > Fire 2 until nearly OOM > Swiftcast > Flare > Transpose > Convert > Thunder 1/2 > Back to normal rotation