With NSG being held in Albuquerque at 6000' and USAC Masters being Colorado Springs, I decided to order the altitude training package from Mile High Training. It'll arrive closer to New Years. I'm curious to see if it'll make a difference. I raced in Utah about a year ago at 4000' and power was off while HR was way up, as would be expected.
https://milehightraining.com/product/altitude-training-package/