I'm with EBates on this one...
28ga is too heavy for those coils. I've found the best is 32ga on a 1/16" coil form. Since going with Kayfuns, my PT2 Mini V2 has sat on the shelf but just a few weeks ago I took it out and wrapped a new coil. I did a tension wound, 6/5 wrap build on a 1'16" drill bit that came in a 1.7 ohm. I wicked it with Japanese Cotton and it's been flawless on an eGo-T battery.
You'll find that the 1/16" bit fits perfectly in the wick groves and places the coil right where it needs to be. Just build it, wick it with cotton but leave it long. Snap the chimney in place and slide the rubber washer down. Then fluff the cotton so that it fills the entire slot and cut it off flush with the rubber.
I get no leaks, shorts, or gurgles and the flavor is great. Now I'm carrying that daily with my other tanks just to mix things up during the day...