Hi Chao,
What many new PSG players don't realize is that there are several different ways to palm-block, besides Jeff Newman's version:
- "Little finger fully extended". Examples: Lloyd Green, Tom Brumley, and many more.
- "Ring and/or little finger curled under". Examples: JD Maness, Hal Rugg, and many more.
- "Hybrid of palm-blocking and 'fingertip blocking' (aka 'pick-blocking')": Examples: Buddy Emmons, Buddy Charleton, and several more, in which thumb-picked notes are blocked with the ball of the right thumb, and finger-picked notes are blocked with the tip of the right hand ring finger.
When I was learning to play pedal steel with palm-blocking, I tried to use the "little finger fully extended" technique, but I couldn't get it to work for me because where the crease in my palm was located.
So I began using the "little finger curled under" technique and it worked fine.
On fast single-string passages, I would sometimes switch to Buddy Emmons' "hybrid" technique (not that I could ever do it as well as Buddy!)

.
Since then, I've also learned how to do "fingertip blocking" (aka "pick-blocking") after hearing Paul Franklin play "Pick It Apart - Mark O'Connor" (at 190 bpm!):
https://www.youtube.com/watch?v=gJkBnt8Uww8 at about 1:09 minutes.
And like many other PSG players on the Forum, I now find myself switching from one of these blocking techniques to another without even thinking about it.
My point is, don't get locked into doing things just one way. Master one, and then try adding one of the others to your skillset.
Take a look at JD Maness' masterful playing...
Here's a screenshot of JD Maness with the Desert Rose band using the "ring & little finger curled under" technique.
Screenshot from: "Desert Rose Band Chris Hillman The Byrds Related Live Austin City Limits Aug 5th 1987 Herb Pedersen"
https://www.youtube.com/watch?v=YfOm9-QI95A&t=171s at about 2:40 minutes.
I hope you find some of this helpful.
- Dave