If you want a little more out of your AEG but don't want to run the risk of 11.1v, try a 9.9V LiFe. It's great for giving your pew a little bit more zip without worrying about as much heat and voltage going through the gun. However, considering it's a EMG CYMA (aka a platinum) it already has 13:1s inside and a nice little mosfet. It'll take fine to an 11.1v as my CYMA platinum SR-25 takes a 11.1v on DMR power no problem (it runs colder than my G36 and UTR does in fact, but that's also because they both have SHS high torques and they love shitting out heat), although on sustained full auto you do run a higher risk of shit going tits-up as you'll be firing fast enough to not notice a jam in time on full auto, meaning you could end up slamming a broken BB around your gearbox at mach-10 which tends to break shit (which happened to my G36 that was running at speed on full auto before I had the gears swapped out)
Wankerguns are a fun novelty so long as you're not, well - a wanker with them. I normally only put my high-speed G36 on 11.1v when at the range when I want to wank out a little and show some of the newer guys some A10 minigun fire for a laugh. As long as the semi-auto is nice enough, and if you're running at crazy RPS on 11.1v with three-round burst programmed on your mosfet to stop accidental grenading of your gearbox I don't see the harm in it really. Just be reasonable and respect the other players and you should be good.
Airsoft honour and morality aside: Yes - your CYMA EMG/Platinum will take an 11.1v no problem. Is it worth it? Eh. Try a 9.9v LiFe instead if you want a little more than a 7.4v without wanking too-bad.