Kind of a tough question to answer..About a year ago I purchased a nice used TD124 Mk1 with SME 3009/2 unimproved
and I went to a DIY Maple ( 1"thick ) plinth and removed the rubber mushrooms ( secured to the plinth from underneath ) and find it to be a great combo..The extra Mass seems to help considerably with performnce..I am not an expert by any means ,but I think the more "Mass" and rigidity you can add the better off you will be..Plenty of info on the Web.....
and I went to a DIY Maple ( 1"thick ) plinth and removed the rubber mushrooms ( secured to the plinth from underneath ) and find it to be a great combo..The extra Mass seems to help considerably with performnce..I am not an expert by any means ,but I think the more "Mass" and rigidity you can add the better off you will be..Plenty of info on the Web.....