Since you already have the ak, why don't you just plug in the iems you have and decide for yourself whether they are good matches or not? Ultimately, it is about whether you like the sound or not - not what a graph says. You should just trust your own ears at this point. If you don't like the sound, you can then decide whether to return the ak or send it in for a mod.
This...why need someone else to tell you what sounds good. Trust your ears :)