Haven’t got anyone to share with, but I wanted to tell someone!
After about 6 months of having one if my babies packed away I got her out and with the help of my Dad in law fixed my leaky Sub problem.
Driver did not have enough meat to bite into on the bottom screw. I fattened the edge up by glueing some flexible wood into place, holding with nails and clamps. Remounted the driver today and no more port chuffing! Woo!
First is fixed at Dad’s, second is when I was installing the driver initially. Should definitely have fixed it then