I'm on day 4 of my first incubation and I have been at 50. I will turn it up to 65 at lockdown. I hope this works and I hope other successful Utah folks will chime in.
I let my humidity sit around 25% to 30% during the first 18 days then bump it up to 65% to 75% at lockdown. IMHO 50% is a bit high during incubation.