Talk to me about your stance change.I think the biggest mistake us more experienced players make is fearing change. Other than playing non-stop, the only way we can get better is by doing things differently. This gets more challenging the longer we have played but it has to be done. I think the two steps forward and one step back mindset is best.
I'm the same age as you and I've recently made a major stance change that took a couple of months to engrain. I'm now cueing straighter than I ever have. I wouldn't encourage major changes but incremental change may be both necessary.