1997 Deiss Rieslings ???

After years of loving the rieslings of Marcel Deiss, I have been perplexed by the grand crus from 1997. I bought the Burg, Altenberg, and Schoenenberg bottlings. Visiting Deiss in Alsace Jean Michel told me that the sugar acid balance was perfect and that the wines would taste primarily dry when they reached maturity. Ok so far. Perhaps I am just lacking patience, but at 15 years old the sugars are still very high. You would not call these food wines, they are more like a German Auslese in sweetness, too sweet for a meal and not sweet enough for serving with desert. They are also rather heavy textured for serving as an apertif, lacking an Auslese’s grace. The colors are all in the dark gold spectrum. And yes, given all the caveats, they are delicious in a unique way, so I am convinced the wines are not flawed.
Does anyone else have experience with these wines? Any opinions as to where they are going and when they might get there? I love rieslings and don’t mind richness ( Zind Humbrecht Brand is fine by me, but so is a Mosel kabinet ), but can’t figure these wines out???