The ratio that you're using (luthiertw) is pretty low in dmt. We've been working mostly with 1:1 and I've found that anything at or below 2:1 (1 ml juice to .5g spice) to be useless--not reliable effects.

How many grams are in one ml of your juice? Different juices weigh differently depend on how and with what they are made.

I don't know if I fully agree with anrchy that the tank system is "useless" but I am finding it to be less useful than I had hoped. The tanks just burn out too quickly (by tank, I mean "atty") and the juice at the end of the tank is WAY thicker than what I started with, thus leading me to believe that the atty is burning more juice than spice. I do get a "high" from the pen, and sometimes a pretty profound high at that, but it isn't reliable. The time that I like using it lately is pretty much exclusively after I come down from a breakthrough trip to extend the post-journey ecstasy.

I will second Anrchy's point that we need more people puffing on rebuildables. I know nothing about them, but if I start seeing solid results on here, I'll go pick one up and start experimenting.