That sunscreen idea is interesting, but I've handled seedlings with clean, dry hands for years and never had a problem. My guess is it's more about being gentle than what's on your skin.

Check your modem and router too. Mine were ancient and always warm to the touch. Swapped them out and noticed a difference.

Tracking numbers is a game changer, I started logging my jobs last year. Seeing the total climb so fast makes you realize how much a small change, like your new rasp method, actually adds up over time.