What does Force Feedback: +Recharge do in Repel?
I'm pretty sure the +Rech proc will be limited to targets affected by Repel once every ten seconds (i.e., the toggle-proc rule). In other words, I don't think it'll ever fire in Repel because nothing is ever in its area of effect for longer than a couple of moments. The chance that something would be in the area of effect at the moment the proc checks would be infinitesimal.
Of course, I have avoided Repel on every one of my Kin characters, so maybe I'm wrong. Why don't you copy your character to the Test server and try it out?
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Just curious, I have the FF: +Rech on my MM and I know it doesn't work on my bot pets anymore so I was wondering whether it would be of any use to my ice/kin in Repel?
Does FF: +rech follow toggle activation rules like Performance Shifter: +End if slotted in Repel? Or does it only proc if it actually knocks back a mob?
If it actually does work, I can probably make Ice Storm perma.