The met rod hanger screw is a tool, not meant to be permanent. Sounds like the primaries need to be richer on the power step. Bigger pump shot might help, really depends on the type of stumble. Options are drill pump nozzle 3 thou bigger, drill pri jet 2-3 thou bigger, get some met rods that have thinner power steps or file the power step on the met rod with a modeller's file.
Can you explain a little further? I read that the starting point for the hanger adjustment is 1.5 turns from bottom (where the hanger assembly begins to move upwards from the lowest position) There was also some language about you should not have to go more than 2 full turns out, is the goal to have an adjustment that is 1.5 to 3.5 turns from bottom?