Polymorph macro help

[bravejohn]

Hello I would like to make a polymorph macro work like this.

1.I chose the target I want to polymorph
2.I cast polymorph in that target but also put it on focus
3.Then I change target and do dps on another mob
4.Now I want to resheep by pressing the same macro (without modifier) and without having to change my current target.

I tried this

#showtooltip
/clearfocus [@focus,dead]
/aftercast /focus
/cast [@focus] Polymorph; Polymorph

but for some reason it is not working.

1. /cast [@focus] Polymorph; Polymorph
this should cast polymorph to my focus target, and if I don't have focus (first time I cast) it will cast Polymorph to my current target.The second time I will press the button it should cast polymorph to my focus and not to my current target.

For some reason I cannot make it cast Polymorph at the first time.If I manually put my target to focus, then it works.

I also tried /cast [@focus] Polymorph; [harm] Polymorph
but with no success.

Any Ideas?Sorry to say this again, I do not want to use modifier :P

Edit : Some update.I managed to figure out to cast Polymorph at first time, I changed the last line into
/cast [@focus,exists] [@target] Polymorph

but now the /aftercast /focus is not working.It does not put my target in focus...