I wouldn't say I'm all about cloud chasing, but when I do it, I usually run with 22AWG Nichrome80 and rayon inside either the Velocity or a MutationX v4. The mod is dependent on how I want to go out. If the rules are mechs only, I take my 26650's out on the floor. If mechs and regulated - I'll take my 26650's and my IPV3-Li.
I also specifically work with spaced coils - more effective wicking in that instance and in most cases, the fastest builds possible. Since almost all cloud comps I've been to require you to build a fresh coil, have a dry wick, require the ohm's to be between .1 and .5, and require you to vape house mixtures... I just prefer the spaced coil vs their micro counterparts. However, I've recently switched to spaced coils (outside of TC) as the spacing between the wraps allows more vapor to flow out of the nooks and cranny's and also helps keep the vapor nice and cool on inhale.
I used to run with wires larger than 22AWG (20, 18, and 16) but found them to be too hot and also a strain on the battery. The craziest coil build to date that won a cloud comp was a 20AWG nano coil, single coil, that I named the hornet's nest - based on the wicking principles of the dragon coil, with a twist... there was only 1 coil, the coil sat flush with the lip of the well, and the wick was packed down into the well, leaving 1 end of the coil open and the other completely choked off.