Typhoon I put cheater spacers in mine, only used a 1 1/2 depth. For any LD fella I built for, I went full depth.
It took me a couple years before I figured out why I hated my Bang BOM driver(s), before I had SMT. The shafts always sucked, it seemed. Then started doing this with the 455's and never did go back and revisit the BOM.
Maybe not too late....I'm breathing. 😄