Misconception about volts and watts. If you're pushing 11 watts, that means that you're putting out 5 volts. Kinda complicated, but 11 watts won't always be 5 volts. 11 watts may turn out to be only 4.3 volts depending on the resistance of your coil. Anyways...
Micro coils won't necessarily help you with your heating problems, but you should REALLY be looking at the over all resistance of your set up. Wrap each coil to 3.0 ohms so that when you set it up, you'll be at 1.5 ohms. Or really, anything under 2.0 ohms and you'll be golden (2.2 ohms with a dual micro coil set up works wonders). I can't really say how many wraps that'll take with 30g kanthal, I use 32g for standard wrap coils and 20/28 for micro (sub ohm on mechs but I can't run sub ohm on my evic, but the 20g with a 12 wrap micro coil wrapped around a 14g syringe clocks in at about 1.8 ohms in and of itself, don't really remember what the 28g works out to, haven't used it in a while). I know for a 32g micro coil, 8 wraps puts me at about 2.6 ohms. Just tinker around with the micro coils a little more, until you make a 3.0-3.4 ohm coil. And then make another. Just try to keep each coil at the same resistance (doesn't make THAT much of a difference if you're only .1 ohm off on a coil), and you should have yourself a 1.5 ohm ish dual coil set up. And after you do that, let us know if it's working better for you.
--EDIT--
Just to kind of give you a heads up of what's going on, if you're overall resistance is 2.6 ohms on a dual coil, that means each individual coil is about 5.2 ohms. And each 5.2 ohm coil is only getting 2.5 volts. Whereas if you wrap a dual coil at 1.5 ohms, you have 2.5 volts going to each 3.0 ohm coil.
