I went with Rayon which pretty much means cutting instead of thinning, really should try cotton with the higher coil though too... I've always had better flavor on a GTA style hole with cotton. Worked it like this. I had tried lowering that 2.5mm coil by 1mm increments twice, and the flavor lessened each time. Probably not for everyone as it does increase the vape temp a lot especially with the bigger coil, but I'm enjoying it with everything I've tossed in and I'm glad to be rid of that weird dryness I was getting with the coil lower.
Thanks for the pics. Looks really good. I put my 3mm almost exactly to the same height as your 3.5mm. Just about even with the top of the screws (just a hair or two higher) and from what I can see in your pics, I'm about 1/16 inch lower than yours. The flavor is very good. Not sure if it is much different than my 2.5 coil that was a bit lower. With the legs on the bottom of the coil, like yours and Hearts (probably most) I had it almost perfectly vertically aligned with the post slots. Now with the 3mm coil I have pushed the coil up so there is a slight angle on the legs. Both set ups have been fantastic on flavor and wicking. I really love the vape off this thing.