After finally settling on an increase of 3/4", the 8 holes were drilled.
That's as tall as it can go without a major investment in a new stand. The stand height was now 35" + 2.25" of spring height.
Also visible is the latest in music stand technology, 4 magnets non destructively bolting down a sheet of cardboard. The panel is inaccessible. Former attempts to make a stand with duct tape left adhesive everywhere. It was finally removed with much acetone & erosion of the plastic parts. Another iteration would involve a hinge mechanism to access the panel.
After a few months, this height proved acceptable. It made the sound less harsh.