For what it's worth, my 9mm has a full heavy Odinworks 9mm adjustable buffer in a carbine length tube and it runs nice. It also has a LAW tactical folder so the carrier extension adds a little weight but I had to cut my carrier weight by about 5/8" to fit the extension so it's probably not far off a non-folding setup.
I haven't bothered trying to tune it with weight because it runs fine. I think the spring is just standard 5.56 carbine spec.
You don't need to complicate things if simple works...
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