I wouldn't tinker with the emulsion holes just yet. Your curve looks mostly flat if you leave the idle and secondary transitions out of the picture with a slight tilt going from rich to lean. Try a .026-.028 HSAB and see what the results are. Generally, as you increase the HSAB, the main circuit starts richer and leans towards WOT (green line). The opposite happens as you reduce the HSAB by starting lean and richen up towards WOT (purple line).
The orange line is a more realistic non-leaner representation of the HSAB affect on the AFR the green and purple show the overall effect.
You can also see the HSAB has the most affect on the AFR curve (both startup and WOT).. Orange Line
The upper E-hole has the most effect the primary circuit startup and a slight effect towards WOT.. Yellow Line
The lower E-hole has no effect on the primary circuit start, it only effects WOT.. Pink Line
You will have to adjust your primary and secondary jet's when you make changes to the HSAB's. If you increase the HSAB, you will need to increase the jet's a few sizes. You will need smaller jets if you decrease the HSAB.
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