Thanks, GM.
I reassembled a "clicker" as per the schematic you linked to back in a past post in this thread. Results were a very accurate, amplified, click without any boom or veil of the sound.
I will remove insulation in the cabinet when I am able to access the bottom hatches, more readily, when the cabinets are on carpet. I hate to tip them over when situated on a concrete floor, accidental dropping or scratches can be avoided.
I am still enjoying the new TL sound of these and I believe with some minor stuffing tweaks and better matched amplification, it can only get better. Visitors of differing levels of listening experience have all reported with positive compliments, even removing the social-biasing, their reinforcement of a positive experience is approval of the design.

I am comfrotable with the size of these as I have the space and proclivity to not be bothered by large speakers. Others are not so acceptable to their size. Is there an alternative in your MLTL designs to enable a similar alignment? Just curious because the reproduction from the 416b is so enjoyable and others may wish to hear what a TL cabinet can do without having the larger cabinets.