[mwebb]

..."BUT... the better way to go if you have the savvy is to get a tuner/programmer and readjust the injector pulse width per given load/rpm."...
on the surface it may seem like this is true ...
it is not really true at all.
if you change base injector pulse width , Mr ECM will see the results in the 02 sensor or AFR sensor and simply adjust injector pulse width back to maintain the Air Fuel Ratio right where Mr ECM wants it to be .
( usually but not always at 14.7 to 1 )
this change in IPW will be reflected at first in short term fuel trim , then after a short while in Long term fuel trim which will allow STFT to revert to bouncing a few percent up and down from zero fuel trim adjustment

despite what you may have read;
you can not fool Mr ECM , if you try Mr ECM will punish you and your engine