ProComp/Speedmaster aluminum heads

Not necessarily.
It might just show you that with a small cam, better heads don’t do all that much for you.

From the “everyone’s an expert file”, IMO that 10deg split of your current cam isn’t helping you any.
I'd love to know why you think that, but maybe on my massive reconfiguration thread would be a better place then mucking this thread up with a cam suggestion possible rabbit hole LOL...