tilt it is expected on any upper coil clearomizer... larger wick doesn't mean better performance in my experience, the best T2 I've had was a short wicks that was the first version of the T2, of course I needed to tilt it more often but as I mentioned this is expected on any upper coil.
About leaking, if you hold it upside down for 10 secs it will leak and gurgle... only tilt just enough to wet the wicks and you will be fine.