I've had (sometimes still) the same issues.
My warm up session before a round always starts with basic motion, going on to aquired motion and longer and longer hits with my pitching wedge, concentrating on delivery line and lag pressure. This gives me a good feel for lag pressure and tempo.
I suggest you try the same.
Before I had a tendency to go to the end instead of top, and then throw the lag away too early.
By the way: this place has taken my golf to another galaxy - I love it tooo
The foundation of my improving game is the 6,000 chips I hit from January to March. Without what I learned then, I don't think I would be able to continue to build on what previously was an inconsistent game. So yes, I start warming up similarly.
One of the things that I learned from the Bobby Clampett book, not from the Lynn Blake website was the importance of the three fingers on the left hand. I now find that concentrating on consistent pressure from those 3 fingers is really important because it has increased my ability to maintain a flat left wrist during my backswing.
Short story.
I joined a golf club this spring. The person that introduced me to the club was rewarded by the club with a number of free guest passes. He wanted to pass on some of the benefit to me and offered to buy me several free lessons with his favorite instructor. Infortunately he was rather bewildered when I declined his kind offer. I have a comprehensive program that works quite well and that I expect I can keep growing with. Why would I hire someone who doesn't know the golfing machine hitting system, to make suggestions about my game?