what about a U wick? there are a lot of holes in the Cobra...i have heard of the cobras small wick hole, i dont actually own one, but imo if at all use a thicker wire untill it requires more then 5 wraps. i would try the 30g with a 4/5 wrap and see what resistance that is, if it is still to low i would go to the 32g. if it was me i would do an L-WICK, so i could use a thicker wire, at least i would give it a go to see how it really performs. i have been told that it works and works fine. it really would only take a few more wraps of mesh to make the difference. but being that i dont really know for sure i would hate for you to have spent hours on the measurements and not work to good. i also been wanting to try the inverse wick, fatter on the bottom then the top, to see if it would wick any better, but this might require more time when changing the wick, because you would have to take the tank apart to release the wick
I'm using like 33mm wide of 400 mesh to get in there...