What key broadcasting software are you using? If you aren't using one..then your key presses won't pass to both windows.

To switch and have a toon follow and assist the other you could use (going from memory..):

Toon1
F8 key: /clearfocus
F9 key: /focus toon2
/pr toon2

Toon2
F8 key: /focus toon1
/pr toon1
F9 key: /clearfocus

If you are using Keyclone with maximizer, you can assign the F8 and F9 keys to the regions, and it will swap the screens out when you change leaders as well.

Then you would need to either add /assist focus to your spell macros, or you can make a seperate key for assist and follow using:

<your_key>: /assist focus
<your_key>: /follow focus

Castsequences..try:

/castsequence reset=target/combat Corruption, Curse of Agony

Shamanistic Rage doesn't need a target if I recall correctly...