OK I will check this today but I thought if Astral Fire is out and you use a Ice spell it cancels Astral Fire. I thought this would be the whole reason for using transpose so you don't have to cancel it out at all. I know it wont take you to Astral or Umbral II/III right away but its just one hit away, versus cancelling your self out and having to hit 3 fires just to get to Astral III.

I use this on mobs Blizz>Thunder2>Transpose>Fire>Scathe>Fire>Scathe>till 100 or so MP hit transpose>Thunder>Blizz>Scathe>Blizz>Tranpose>Fire>Scathe>Fire>Scathe>till 100 or so MP hit transpose. I will throw in a thunder2 again if the max icon pops up. But i feel like this rotation did way more dmg then just the crappy DOT thunder and waiting on Fire and Ice cooldowns. Scathe does good dmg when it crits and doubles plus t cost 25% as much as Fire at Astral 2 level. Plus it does not interfere with the time cycle of Fire,Ice, or thunder and is pretty much instant cast.