Holley/Demon Carb stumble

I would really like some more to chime in on this.

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Years ago I reached the point where I got tired of arguing with people about it.

The PV rating has nothing to do with the idle vacuum.

The PV’s purpose is main circuit enrichment at high(er) engine loads.

What does that have to do with the idle circuit, or idle vacuum..... or the engine idling at all?

I highly doubt it is the source of your bog problem though, however it is a cheap and easy test.
Just put a PV plug in the primary side and jet up accordingly.

My default PV is a 6.5, and almost never use anything lower......... even when the cams are way way bigger than yours.
Even a motor with an .825 lift cam that’s in the mid-280’s @.050 pulls reasonable vacuum when you’re tooling up the return road at 2500rpm........ so the PV would be closed....... helping to keep the plugs cleaner.