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Going in the right direction!

Since you have a way to datalog manifold vacuum, check to see where the problem is. That will let you know where the enrichment is coming in, and where the springs needs to be.

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Alrighty, looking at the log, assUme-ing I got my voltage-to-vacuum conversion correct (pretty sure it is), at 'light' throttle, it drops to ~5"hg with high 11s for AFRs. As speed increases and I pass through ~7"hg, AFRs shoot up to high 15s & low 16s. Which makes sense with the 7" springs in.

Just went for another drive with the Orange springs in. At light accel the AFRs stay high. I do think my pump shot either needs to be bigger, or longer, as it's spiking to 18ish just off idle, right when I feel a hesitation now

Looking at another light acceleration; vacuum is 5.5ish with AFRs in the 15s. Right when I give just a little more throttle and it drops below 5" vacuum, AFRs drop to the 14s.

I've been debating whipping out a circuit board for this manifold vacuum sensor and selling it. Not sure if anyone else would find it handy though, as it requires the LMA-2 RPM adapter to work

Attached is a light acceleration pass with the Orange springs, and accelerator pump in the 3rd hole. (For some reason it logs the tach as being really jumpy. Probably the points bouncing )