Bad news, Jim. I downloaded the samples of the other two books (3 and 4 in the series) and they were azw1 (topaz), too. On the good news side, though, I would have sworn that book 3 wasn't there yesterday.
I find that I normally read at size 2, sometimes switching to 3 later in the evening. With Topaz formatted books, I find the redraw time at size 2 to be unacceptable, but size 3 isn't terribly bad, just a little slower, so I read most Topaz books at 3.