Very intelligent chime, yes the 6-7" 30mm seems optimum, very interesting on the huggett snipe, the Donnyfl koi, the huma mod30 following the same footprint.
I believe Huma Air are under rated and nice there module, being stackable, I have the Huggett Snipe because I got a deal but it out did others I've had but looking to shave off a couple more dB's and this is really a lot of fun trying anyway.
Neil Clague's moderator are OK, but he seems to not follow his own advice as closely as I would hope in keeping the hole size closer to the pellet size after receiving a few of his mods, being over sized enough to drop the next size and more pellet easily through the center of it
He's cranky about not using a sound meter to research mods, claiming you get a better reading using your ears only
FYI please state the mod you have from companies that make multiple models in this thread ? Weihrauch looks interesting, but most Euro companies won't sell to US buyers
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