I use a 3 mm coil with rayon. I make my wick as long as I can and still get the chimney on. I dont know. I keep my airflow wide open.
In the big Lemo thread that I was reading back then a lot of people said they put the chimney on with the wick sticking up long, then cut it above the chimney and push it down. I did that for a long time. Make it long enough that it doesn't pull down at the ends of the coil and leave gaps. It should come up a bit at the ends of the coil. I think that was what they called rabbit ears. Now I cut the wicks first and put the chimney on over them. You have to be careful the ends don't get caught in the threads and pull the wicks sideways. Then I use a dental pick to get the ends of the wick loose and evenly spread out. Also I used to wet the wick and stick it to the sides of the deck before I put the chimney on. Now I put the chimney on dry and drip juice on the wicks after I get the wicks where I want them. Seems to keep the wicks fluffed up better that way.
A lot of people had previously used KFLs and were used to thinning out the ends of the wicks. You want to keep them thicker with Lemos.
I'm trying to remember. I did experiment with adjusting the height of the coil above the airhole. Can't remember what worked best. I can definitely take a pic of mine next time. I think raising the coils up helped reduce leaking from the airholes.
I use 70%vg. I had problems with more PG.
I do still get juice in the base part of the tank where the airholes are. I take that off from time to time and clean out the base and in the gap around where the airflow ring is.
Basically they are fussy tanks. Worth it though IMO.