Spoke to the vet today, and it's time to start tapering Grendel off of the corticosteroid.  He's been on one every other day, so now he goes to one every third day.  If he does well on that schedule, we stay on it for two weeks then reduce it to one every week.  Again, if that works well, then, after two weeks, we take him off of the pill altogether.  He's done well on the inhaler, so I'm hoping I can finally get him off of the pills.  Here's hoping things go as planned.