Previous results with 64 p jets and 76 (D) and 74 (P) secondary jets:
""Idle in D: 13.6-13.8
40mph:14.0
50mph: 13.8
55mph: 13.6
60mph: 13.6
4000rpms (apx 75mph): 13.2
50mph to WOT: 12.8(D) 12.6(P)""
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I could not stand it that my 50mph+ A/F went as rich as shown. So I decided to drop my primary jetting from 64's to 63's. I knew that this would cause my WOT numbers to go lean so I swapped my rear jetting to 78/76.
My new results in cooler weather (53-59 deg.):

Idle in D: 13.6-14.0
40mph: 14.0
50mph: 14.4
55mph: 14.2
60mph: 14.2
4000rpms (apx 75mph): 13.8/14.0
50mph to WOT: 12.8(D) 12.8(P)

As you can see, the main jet swap from 64's to 63's brought my 50mph+ numbers back up about .6-.8 in the cooler weather. This is where I want to be for cruising.
Now I have a question about the secondary HSAB's and their function.
I would love to just swap out something external when the outside temps go up and down. I am still very close on my 50-WOT A/F numbers (12.8's & aiming for 12.5-12.6). My current stagger jetting on the rear looks good but instead of opening up the rear bowl again to add 2 more jet sizes per side, what about swapping my SECONDARY HSAB's ONLY from the current .039's to .036's?
Would this change mess with my 50mph+ A/F cruising numbers?
I would love to just swap out secondary HSAB's as the temps go up/down since they are so easy to get too.
What do you think about this change and it's affect on my cruising A/F?

Thanks