I noticed Master Lin's very straight fingers. They seem very relaxed thought.
I've played with the finger extension and found that my hand can feel relaxed in several positions. What I usually do is as I start a walk or meditation is I maximally extend my fingers and then let them relax. This result in a more extended but equally relaxed position.
I experience that puffy finger touching sensation within seconds of starting a meditation. Often before even getting to the password. The sensation gets stronger the more into the meditation I go.
When I was starting (like I'm not still a beginner) I would occaisionally open my eyes and check my hands. They felt as if the fingers were touching and curled, but when I looked they were straight-ish (not like Master Lin') and separated.
I've also notice that the slight shoulder rotation needed to slightly extend the elbos to the side really opens the channels for me.
You are perfection.
Iam2 
P.S. Gallen you post are often long, but always well worth the read. Please don't change your style. Thank you.
