Hi Carolyn,
I've made the recipe twice (cinnamon raisin version) with good success.
Here are the things I found helpful...not sure if they'll address your problem
* To approximate the specified high-gluten flour, I added pure gluten (from
the local health food store) to bread flour. Assuming that bread flour is
12.5% protein and gluten is 100% protein, and using some high school math,
I calculated one should swap out a little more than a quarter of an ounce
of bread flour for gluten in both the sponge and the dough.
* I found it necessary to bake the bagels for 50-100% longer than specified.
* I didn't think the bagels' texture was quite right until several hours of
cooling/drying out (despite their small size).
Hope this helps!
Allen