Well, I finally got to brew this beer today. I missed the OG by a few points. Mine was at 1.068. I did use the Williamette, but added at 10 minutes instead of 15. It did increase the "hoppiness" of the nose, but didn't impart any real bitterness to the wort.
It smelled and tasted wonderful. My starter was very active so I am thinking I will be seeing activity in the primary before I go to bed tonight.
I have to confess, I have never had an actual Leffe Radieuse. I brewed this because I have liked every other Leffe beer I have had and the recipe sounded like it would give a great beer. If the beer picks up some of the "classic Belgian" tastes from the yeast and combines with the malty/nutty flavor of the wort, this beer is going to be amazing.