Too many posts. Had this in the wrong spot, tied in with another thread.took a good look at the mount tonight and was unpleasantly suprised to find that the flex is primarily from the frame. The area of the rail is hollow inside with some minor ribbing.
I see a couple of ways to approach this:
1. Fill the open area with a compound which will harden and stiffen the unsupported plastic.
2. Design a mount which slides back against the front of the trigger guard and lock onto the frame.
3. My wife's pick - Leave it alone and see how it works out.