56 y/o C-spine discs don't take crashes well like a 17 y/o disc would. It sounds like you are doing the right things...I would add spinal decompression and laser therapy
Tourney PB and practice PB should be the same unless you are cheating in practice. If your driver is bumping the buoys and running slow you'll run 39 every time in practice.
Ski ride set should equal a chiropractor visit...$65 for screwing your back up during a ski ride and $65 for straightening your back out at the chiropractor.