I think the problem is in pickups. Try to get kind of the same pickup you got right now and reinstall it with the new one, if that doesn't help - get it to master.
The Huntingtons use goldfoils. They’re not a pickup design that’s easy to find a replacement for if you play bass. And I’ve been given to understand Supro did a slightly unusual goldfoil design for the Huntington’s pickups. So AFAIK there’s no ready close substitute pickup to drop in a Huntington at this point.


