How much does 1 jet size affect A/F?

Is it correct to think that the uphill part throttle is more throttle than at cruise? OK, I just looed at the vacuum numbers again and yes. That IS a lot of vaccum at cruise and part-throttle-uphill. (Curious to know why...??) Are both at speed so that wind resistance is significant? (> 45 mph).

If so, then, yeah, I would expect the AF to move toward WOT levels at part-throttle, uphill. But again, why such high vacuum numbers? Is this intake vacuum?

Are the power (step-up) spring levels rated to manifold or to throat vacuum (like ported)? (I have not found that info for sure yet....) That's important to know, so as to know in which direction to move the spring number....From looking at the catalog pix, the shorter springs (weaker?) look to be the lower number.