I just got the idea to try small diameter fuel tubing from the pump to the carb (OS 120AX):

My engineering school brain says it won't make much of a difference; the pump is working at a given rate based on engine speed and therefore provides a flow rate independent of tube size. The smaller diameter tube will mean that a smaller volume of fuel will go through the tube, but will flow at a higher velocity providing an equal volumetric flow rate compared with the larger tube. Unfortunately I don't know enough about how fuel is drawn through the carb and thus how it would respond to different loading conditions.

The other part of my brain says too much fuel to begin with, smaller fuel tube has got to change something.

It's pretty late and I feel like I'm missing something (like what might happen at WOT?) so any thoughts would be great. As of now the screw on the pump is out far enough that I'm worried about it falling out and my low speed needle is either fully closed or darn close to it. Performance is OK idle, decent transition, and decent top end. Not much room left for adjustment but I believe I should be able to achieve very good idle, transition, and top end.