I'm kind of surprised that you don't get any anxiety on the comedown. The trend for me was that my first experiences were the most intense and ecstatic, but they had worse comedowns (higher flight, harder fall). I've been using it for a decade and the magic is alive and well. The max frequency I ever used was monthly for about 4 months; after that once every 3 months, then a couple years break, and now I used approximately annual/semi-annualy. The major difference that I actually like (in a way) is that it's not so much bursting with unrelenting intense joy. Likewise there's minimal jaw clenching compared to when I used to chip teeth. I actually had a dental cleaning a couple weeks after a roll and they said evidence of grinding; I knew why, kept my mouth shut. It's very blissful, peaceful, reflective and therapeutic, just not cataclysmic ecstacy. The lack of that intensity has the benefit of resulting in mild comedowns. I still get a bit of come-up anxiety and comedown anxiety, but the anxiety in negligible to that of the past.
I think it's simply a result of how experience brings perspective. When you've never experienced something, the first time is the most profound, following experiences are relative to the first one.
The magic remains if used moderately, it just matures, and I quite like the way it's matured.