Sooooo glad I posted this.
I removed my Puresound Tetuto gunmetal mat on Forum advise and, bingo, the sound got more solid and better! The 301 came with the Tenuto and, since it was $400, figured it was best. No way. The original 301 has a rubber built in mat. Just tried the Sakura Systems Boston Carbon Mat. This is the one. Tighter bass and more control. Much better than without and better than the Tenuto or no mat.
I removed my Puresound Tetuto gunmetal mat on Forum advise and, bingo, the sound got more solid and better! The 301 came with the Tenuto and, since it was $400, figured it was best. No way. The original 301 has a rubber built in mat. Just tried the Sakura Systems Boston Carbon Mat. This is the one. Tighter bass and more control. Much better than without and better than the Tenuto or no mat.