No dis-respect intended here, but I'm with Andrew on this one.
Carb design is a hugely complicated, expensive and time consuming project (even in our days with computer aided design) There is a stack of variables that need to be balanced. Designers typically have first degrees in fluid mechanics and are armed with archives of experience, and simulation results.
Although I can see that filling will indeed reduce AFR, I doubt very much that the filling process takes into consideration the balance of other side effects.
Changing a jet for a properly designed and manufactured one for that specific purpose ensures that you are getting a properly designed product that will deliver a metered amount of fuel according to the throttle position...and not just a hobbyists nearest guess.
If distance is a problem, perhaps you could get remote advice on the right jet for you....mail order it and ask you local greasemonkey to fit it?
I know you will get the boost you are looking for one way or the other though...good luck and nice one for keeping us posted on the developments