I vividly remember the day when I switched from a PT2 to a version 1 of the R91. Much better flavor and I got a NIC buzz the first day. Like many things in the vaping universe, find what works for you and expect to read different approaches and thoughts on any given issue. This is all good.
Depending on what version of the R91 you purchase, the following video will help you understand the center pin connector on the R91:
https://www.youtube.com/watch?v=TctmMqxe2qs Also read some of the comments about the Version 2.
I never lowered my NIC but just vaped less untill my system adjusted to this significantly more efficient delivery system.
The Kayfun users manual has some great tips for you to read. Like this:
"Find comfortable nicotine level. When you use Kayfun for the first time, try to start from nicotine level twice less than you used to! For example, if you used 12 mg/ml liquid - start from 6 mg/ml on Kayfun. Kayfun has excellent nicotine delivery and vapour production capabilities, so it is easy to get nicotine overdose for want of habit. Choose optimal for you nicotine level, but we do not recommend using E-Liquid with level higher than 12 mg/ml with Kayfun - it can be dangerous to your health."
See:
www.meshweaver.com/temp/vaping/SVOEMESTO_KAYFUN_v3.1ES_USER_MANUAL.pdf
Getting started can be challenging since ECF has users of different experience levels. I would suggest a thorough clean of your R91 or whatever Kayfun clone/real deal you decide to purchase before you use it. Study the various parts and then create a simple build to get started. Wrap the Kanthal wire around the wick (Silica/ekowool. NOT cotton or derivatives) first and then install. The length,amount, and placement of the wick is critical and the issue that causes most of the problems. If your first build doesn't win a beauty contest don't worry about it. Does it vape properly and reliably? Are you getting the better flavor and enough NIC to make you happy? After a few simple builds you can begin to create more advanced builds and continue this untill you are happy. BTW, the way you vape can also influence the amount of NIC you ingest along with the flavor. Pre fire and then long, slow, and deep lung hits will normally satisfy many of our desires. As opposed to a lighter/shorter draw that you don't suck into your lungs.
Their is no shortage of vids and help. /lol I have a short blog entry with pics which you may find helpfull at:
http://www.e-cigarette-forum.com/fo...en-mere-mortals-like-me-can-build-kayfun.html
ENJOY!
EDITED for clarity