Rodman99999, from afar, I like the way your TL woofers look!
Nestorovic was a most capable loudspeaker designer/builder. Are you still using the Acoustats for the rest of the music? I've always been a fan of them.
My own TL subs, which were Bud Fried's personal units (he gave them to me just before he passed away a few years ago) sound similar in that they also use 10" (Gefco) woofers, with the line just a bit (if memory serves me correctly) longer than yours. They are referred to as the "O" subwoofers, which served as an upgrade to the "D" subs that were a part of the Valhalla System, which was the definitive product that represented Bud's life's work of what I like to refer to as the "Holy Trinity" of true TL bass and midrange (ala the "C3/L" sat"), series crossovers, and low Qts drivers.
In my opinion, the dacron (or, fiberglass) you employed is likely the best damping material choice for a TL. The foam Bud used breaks down over time. Long fiber wool is the considered the gold standard, but is subject to attack by moths, though there are products available these days that can be employed to address that.
