Looks very intresting... I will have to give this a shot.
It seems to me that some of your leaking issues would be solved if you used an atomizer with the bridge still in it and put some filler material in the cartridge you have the bottle attached to.
Cool, let me know how it works out for you. The atomizer still does have the bridge in it, and since, I have also tried putting filler material into the cartridge. Seems to work pretty well but at the expense of being able to take multiple successive draws. Guess you could just cut down on the amount of filler used to remedy this.
I have since relocated the bottle assembly to a box mod I recently made. It's in a 4AA box with 2 14500s in parallel and the bottle in one slot with the tube coming out of the top and the 90 degree fitting inserted into a hole in a clear "drip tip" that I made out of a pen. It's actually a decent mod that I'm pretty happy with so far. Since putting it into my box mod, I've also turned it into a "suck-n-draw" type feeding system as seen from Parallex2 and I'm sure some others. Just did this by poking a small hole in the top neck of the bottle with a safety pin. This allows me to simply suck on the mouthpiece to get liquid to drip into the atomizer, and I've got a cutaway for the bottle that allows me to squeeze it in order to suck the juice back down so it does not continuously drip into the atty on each successive draw, thus limiting and basically eliminating a flooding issue.
If anyone would like to see this setup, I'd be happy to post pics.