From all the writing and discussion I've seen about improving ability most of it has returned to the right hand and arm.
The idea that the right side is after all the side that causes the vibration is interesting.
I'm starting to become aware that the left-hand is actually the intelligence focus and the confidence builder. Being decisive with the left hand seems to resolve right arm issues.
Focusing on the left hand and focusing on the sound quality seems to make a big difference. Focusing on right hand technique seems distracting and secondary.
I believe intonation and tonal composition is more important than sound production. It actually drives sound production.
It's as the the left hand drives the right!! Fascinating.
None of this stuff applies to everything though...