When I build my Kayfun, I aim for .8-1.0 ohms. Any lower than that and the vape is just too warm for my liking and any higher it starts getting too cool and the vapor is less dense. I also discovered a technique that virtually eliminates dry hits and leakage no matter what juice I am using. I can't take the credit, I found it on youtube but can't remember who posted it. I am using a 3/32" bit which allows for lots of fluffy cotton.
I build my coil and install it perpendicular to the posts as 5spike suggests.
I then wick with cotton and leave about an inch on each side.
Fold the wick upwards and install the bell with the wick poking out the top.
Cut the wick to about an 1/8" above the bell. Then blow down onto the wick which will separate all the fibers. Keep blowing until the wick is all fluffy.
Using a needle or the smallest jewelers screwdriver, gently separate the two sides of the wick.
Then gently, starting from the outside, poke the wick down into the bell, forming a half moon shape on each side of the coil.
Don't poke the wick down tight, you want to keep it as fluffy as possible.
When done, you should have a half moon of wick filling both sides of the bell, and all you should be able to see are the two screws and the coil. the wick shouldn't bend sharply off the coil and should be even with or ever so slightly higher than the coil.
Screw in the chimney, then remove to ensure that it doesn't interfere with your wick. If it does, lightly tuck the wick in a bit further.
The wick action, vapor, and flavor is amazeballs, I haven't had a dry hit yet using this technique.
I hope the description and steps make sense. If not, I'll try to get a picture posted later.