I'm inclined to agree with you. Where you following an FDMB-like testing/dosing protocol when you gave him Lantus or ProZinc? If not you might not have seen what Lantus can do, especially for a bouncy cat. When Teasel was first diagnosed in January 2016 he was on Lantus and I followed the usual vet thing of try a dose, do a curve after a week and then assess. That method continued for another 6+ months once Teasel was switched to ProZinc. Zero success. It was only when I came to FDMB in August 2016 and tried the forum's test, log data on SS, assess dose that I began to make headway and learn my cat's true responses. I saw over time that as hard as I might try, PZ allowed him to bounce like a mad man. Long story short, he's been back on Lantus several months (by way of a period on Levemir) and doing much better. Still bouncy, still prone to big drops out of nowhere but better overall.