Thanks for your input. Good stuff.
I have a question regarding the comment above highlighted in red. Wouldn't the OP's pocket angles need to be corrected for this to be true? In theory, a wider pocket angle exposes more of the pocket to the ball. The OP said his angles are 142°-143°. Would that be wide enough to rattle a ball fairly deep in the pocket? Deep enough for the subrail portion of the pocket to come into play? The OP's end goal is to make his pockets play "tougher" but not necessarily tighter than the current 4.5". Perhaps a better solution would be to install 1/4" facings and changing the pocket angle using the sanding method discussed in another thread.