Need help with Arcane macro

Ok so I made a simple macro that is just to power down targets when you aren’t worried about mana, The problem is I use AHK and if I do it like:
/cast [nochanneling] Prismatic Barrier
/cast [nochanneling] Arcane Power
/cast [nochanneling] Arcane Missiles

It will just blast the hell out of the target and then wail on anything nearby. If I add in /cast [nochanneling][combat] Arcane Missiles, for some reason it ignores the [nochanneling] and just rapid fires missiles and drains my mana like crazy. It will fire midcast of the previous one. I tried putting in a space like [nochanneling] [combat] and no change.

I’m using it on a level 117 and pulling 7500 dps which is awesome! But I am trying to get it to work right and for some reason it isn’t. When it ignores the nochanneling I am hitting WAY higher DPS but burn through my mana in one target.

The full macro is below but I wanted to show the text of it so you all can see what I am talking about. I added in two more lines of Missiles and no matter what it just goes wild.

dCJ(baGEuv9suPERQyBqOMTuUju8lvQBlQStLAVKDJSFq(jQsddvXVPQbcLYqPidwvnCkWbrf6yICCujTqiTukQfJkYYLQhIkXtfwgu9CLmrrvtfutMcA6kUiuQEMOCDvPnIkQTIkyZqjTDiKpcL4RuO(mL6YsgjfYHbgnL8yQCsuvonkxtfDEi6UQW0ujVgcwjbRDsHjEng7MZZRXBTXfScyqROzPaplLszzkYxyf82gTtk447y57kWa6iT8VgYig2WsNXp)nKqFJyT2sryq54lV2igxbgGR75q1xmpTeS2jbRDsXTdSgO)d5DwaIQgJSpG(4zNxN8OnUIBhynq)hY7SaevngzFa9t48CHRDMIBhynq)hY7SaevngzFa9ptxzAFP42bwd0)H8olarvJr2hq)Z0vM2NkUDG1a9FiVZcqu1yK9b0)mDLPGl(CCcmcvHrfWqHQyxoeeQc0QncvHzgzNeQc4oJqOMKqva3zec1GlufCxinxTcSkbRrb3fst9ATeS2jf3dOBxtrvoKq)hYBb65o0OWmJSXfQct(1Gb46EbRrHPEHb46EbRrrmLbC(LCdZtkIIRVfnmqtJgfya0lOXhnvhrfnmpjunAKa
POWERDOWN

Talents are 2311133 and I’m running at 50ms

I have modified a lot of macros to customize them to my style but this is the only one I started from scratch so I may have missed something.

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