Tite Lok Rod Holders
Drill extra holes in the t-bar to allow more horizontal adjustability.
Or for more and easier adjustability, take the adjustment washer completely out and replace with a piece of inner tube. This doesn't give total horizontal stability, but works pretty well until a gar, catfish or spoonbill decides to play.
Still working on a way to make vertical adjustments easier. That seems to be the primary weak link for the Tite Loks. I can drive myself even crazier trying to get the rod tips level.