Revert the 7 second immediate cooldown, make the EMP only active while the cloak is up, or only up for 1 second after the cloak goes down. This allows him to keep his flanking ability against proxies.
Alternatively, you could completely remove the EMP, and replace it with the backdoor ability I posted here: http://forums.dirtybomb.nexon.net/discussion/28551/merc-idea-turner#latest