Yeah, a direct fit cartomizer would be great.
I've seen pretty good performance so far from the tea bag mod. I've noticed that the performance seems to degrade after a few days though. I wonder if the residue builds up and just becomes gooey causing it not to wick anymore. I also wonder if there is anything I could add to it to loosen it up without wasting the juice that is currently in there. It might be worth it as an experiment to take out the bag, clean it thoroughly (if possible), and see it I get the same vapor production I had before. If that works, then finding something to 'ungoo' it might be worth considering.
I made a new tea bag mod yesterday and am still puffing on it today. The vapor production over that amount of time is very impressive. <just took another puff - very nice > So it has performed well without a fill up since about 5pm yesterday. It is now about 1pm, and still going strong. That's obviously not constant vaping, but it's just nice to be able to pick one up and not have to goof with it first thing in the morning.