Happy New Year - swing faults don't go away overnight

Hi all. Back to the range after the busy holiday period. Still the same few swing faults.

1. Still have the left shoulder spinniness. This could have be a combination of tennis and my old swing. Results in a slight pull and cut. Accompanying this error, not sure if it is caused by it or just an end result of it is that the arms don't come down vertically. (the first movement; bum of hips and the arms dropping while maintaining the wrist hinge) The arms then pop out a bit and contributes to the in out swing and possibly lends to casting. The early spin out of the shoulder also upsets the delayed head position. And because of the aroundness of the swing, its impossible to swing on the proper plane to get the correct 'extension'. Without extension, you are unable to accelerate the club properly after impact with the ball.
Crap.... it seems golf is a cascade of things which may or may not be linearly linked. That's why at times a lot of the swing mistakes are not correctly fixed, cause the error corrected is in the middle of the cascade rather then the root or start point of it.

2. Second error is still a fundamental problem of mine. It's the swing tempo. The metronome helps and counting off ' one thousand , two thousand' definitely helps. Maybe should really consider getting the orange whip. Will talk about this training aid another day. Apart from the tendency to swing fast and spin out and throw the club head, I have this jerky thing. I usually do a nice take away to the top, but at the top of the swing I tend to push back a bit more to get the swing going. This is a problem that I a slowly eradicating. Whats so bad about it? That quick jerk tends to change the swing plane cause the motion is not consistent and also results in shoulder tilt or shoulder rotating. And because the jerk is a load up tension type of jerk, it causes me to throw the club head with the resultant loss of lag. It also causes the swing arc to be smaller and tighter too, not what you want.

So that's that. Here's to a great year of golf ahead and great swing!