OK, decided to replace one of the modified beater brushes with a bristle style brush. Most Roomba style bristle brushes have a larger diameter than what the extractor brush deck can accept. Looking through the Roomba parts bin presented a solution - (a Dirt Dog small bristle brush). Of course this small brush has the proper diameter but the length was too long.and the yellow bushing was not able to fit the extractor brush deck. Below is a picture of the small bristle brush disassembled and cut to the proper length.

- Shortened Dirt Dog bristle brush
Here is a picture of some Plastic epoxy that is very sturdy for use with Roomba plastic parts.
And here is a picture of the modified Dirt Dog small bristle brush installed in the extractor brush deck.