Problems with Highwater clays!!??

I have been told that a bunch of potters are having trouble with Highwater Clay (Phoenix and Orangestone) dunting after firing. (Cynthia Bringle and the Penland class, Jon Ellenbogen, Leah Leitson, etc).

Just wondering if anyone else is experiencing problems.

I assume it is related to Custer Feldspar loosing 2.5% potassium (went from about 10% - about 7.5%) but unsure if it is because it is in both the clay and the glaze or just a clay body problem?

Let me know so I can see if there have been any solutions found.  

Here is an article on the subject if you are interested:

http://www.ronroy.net/analyses/custer-article-.pdf

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