So last night I tried the darkroom automation yardstick, and took my readings from a height that would equal a 2 stop difference. It worked perfectly.
What was throwing me off, was these silly height numbers on my fancy German autofocus enlarger. I have no idea what they mean! Certainly not inches or cm. I was trying to use that new height vs. old height equation without success.
Thanks for the replies. Thanks zonemaster, thanks darkroom automation.