Hi and Welcome.
I gave the speakers to a pro and he is designing and making new crossovers for them. I haven't got them back yet, but I expect the new xo's to be an upgrade even over the T3's xo.
Wow! That seems to be a very good idea. Could you please specify on what exactly you used. I may order some from Home Depot, if you give me the brand and their type.
Did you glue them to the walls?