Well, more than 10 years on and Dan sort of did and did not. Think of it more like phases. Oddly, the original post from April of 2008 had nothing I could find today regarding BE.
Also, near the end of 2008 marked a shift and improvement in the overall art as there was a stretch of fewer posts as Dan was retooling, upgrading software and hardware, etc.
There was a good deal of BE running through 2018 or so.
Here is one from April of 2018, ten years later.
Dan is much more about transformations so BE is part of that. It makes the comic a little odd regardless.
He has also noted a self-imposed maximum (which he only broke one time as part of a character's thought process in which breast immobilization was the topic) of PLUS 9 cups, or +9 above base size. Dan thinks more like a D&D player than as a comic writer and it comes through in the stories.
This does mean that there are a few rather large BE sessions, but nothing much above M or N cup ever.
For me that is fine as the plots tend to be of a "high school level after school special" caliber.
Artwork is from Dan Shive, El Goonish Shive