snug is fine...when to tight such as the old RS RCA plugs where you needed 2000lbs of pull to release there grip.They don't have to be super tight.Just a snug contact.
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The important thing to me is that the center pin is gripped tightly enough to make secure contact. If it isn't, you can't make it work better by tightening the outer portion. If the center pin is split, you can make it tighter by running an x-acto knife down the split. If not, I'd opt for a different connector.