Ok, I really don't understand anything that is going on in this thread, but what I do understand is the D2 and TC tanks on top of it so here goes... First off a 25mm atty fits perfectly on top of the D2, it might as well be sitting flush with the sides it's so perfect. My Subtank Plus is my everyday go to.
With my single coil tanks on my D2 I typically use one of 3 builds: 12 wrap spaced tempered 26g Ni 3mm ID, 10 wrap contact 24g Ti 2.5mm ID, or 6 wrap spaced 24g Ti 2.5mm ID.
With the D2, if you have it set in Ti or Ni mode, the D2 will only recognize the coil if it is above .05 and below .3ohms. Therefore, feel free to build your Lemo 2 at any ohms you want as long as they're between those two limits... I have a Lemo 2 on the way and a buddy who uses the Lemo 2 exclusively and he uses it on his D2. He said the build deck is so huge he does some crazy builds on it as well... I've seen one made with 28g tempered Ni where he made a serial build coil... He wrapped 10 wraps around a 2.4mm screwdriver then left a space and wrapped 10 more left a space and wrapped 10 more... using screwdrivers to help he bent the first set and the last set back towards the middle set, what he had was like a pyramid of coils that acts as one coil since they are all connected with no positive post interference...
If you still have any questions feel free to ask away!