I've finally got a good setup for oils and concentrates. Back to my original post, I use some pretty gooey concentrates in the DaVinci.
OF has a great method of using the volcano liquid pads (wire pad) and putting them into the oil cans to catch the thick liquid. Unforunately, I had to order the pads and they're hard to find where I am. If you have access to these wire pads they will work so go with this method.
If you don't have easy access to the wire pads like me, then you can take a few of the extra screen filters that came with the DaVinci and just fold/fill one of the oil cans and create your own wire pad. It'll catch the oil and keep it from leaking into the rest of the unit.
DO NOT use the cotton with gooey concentrates. The cotton doesn't heat up like the metal can/wire does which transfers the heat to the oils. It just doesn't get hot enough and the cotton blocks air flow through the can which is pretty essential for it to work.
I find I need to use fairly high heat around 390-395 for a short while, allow the device and can/wire to heat up, then you can turn it down a little. Basically everything just needs to get hot enough.
That's about it. The Davinci does work great with concentrates, you just need to tweak it a little to get it going.