This is what we expect from the control, and have seen this in several thousand installations. I would not be surprised to see the defrosts space out even further as the humidity begins to moderate. The controller senses change and continues to learn the operating characteristics of the coil. It responds to door openings, stocking and ambient conditions and modifies the defrost schedule accordingly.
I am glad you are pleased with the performance, if you or anyone has any questions please feel free to contact us, we have 24/7 phone support.