How much does 1 jet size affect A/F?

Okay, I was able to sort out the small fuel leak. Took the car out for another run with the following settings:

Primaries:
rod 6542, which is 1 step lean on cruise and only 0.5 step lean on power section of the rod, with jet .092 (this combo is #16 on the carb tuning guide reference chart)

Secondaries:
.089 jet (which is 3 steps lean)

Here are the results (based on 5 runs)
cruise A/F 14.5
Part throttle A/F 15.5 - 16.5 (16.5 if going uphill at part-throttle)
Full throttle A/F 12.5

So my Part throttle is way to lean, and I think it is because my engine has such strong vacuum at cruise (20" at cruise) that on part throttle (11"-13" of vacuum) the step-up spring is still way to weak to move the primary rod into the power section of the rod, what do you guys think?

I'm currently running the purple step-up spring (rated at 7"), so I'll switch to the strongest one i have but that's still only rated at 8".