I got this one figured out:
I ordered a 2' piece of 1-1/2 stainless square tubing from
http://www.speedymetals.com .
I cut a piece about 4" long and put it under the bimini bracket.
How to: Cut each end of the 4" piece on about a 22.5 degree angle leaving a big enough flat area on top to mount the bimini bracket that you already have. Screw the bracket to the boat and the bimini will then lay back flat. I am inserting a crude drawing of what this will look like - hope it is viewable.