I agree, displays can be harder to achieve correct parameters. It helps to keep an eye on the animal's habits.
My king cruises at night, and hides during the day. The corn hides most of the time in winter, although not necessarily under the warm hide, nor on the RHP warmed ledge (both are regulated by a VE). One reason I recently switched out my last HydroFarm for a new Herpstat was that the Rosy was cruising *too* much. She is frequently out draped elegantly on a branch, but she was out and restlessly moving all the time. I think the temp swings from the Hydro just weren't comfortable for her.