Decca London Super Gold Compatibility Question

Try tracking at 1.65g.
Use a heavier headshell. 
What issue are you having?

Soundstage is wide and tall but it's dull and thin sounding. 

I'll try the lighter tracking (I was at 1.8) and the sme headshell with some added mass and report back. Thanks. 

Some people claim the Decca/London design doesn't like the knife-edge style bearings of SME arms. If you can get your hands on a Zeta at a reasonable price (under a grand), snap it up! Johnnie at Audio Origami knows all about the arm, and has restored and/or rewired many of them. A real good arm for the D/L's.

The Decca is a quirky design. It has different horizontal and vertical compliances. So neither a low mass or a high mass arm will work optimally with it. The best arm for it might be the Sony Biotracer (on the Sony DD TT). This advanced-design arm has the ability needed to compensate for the Decca's wayward-tracking in both horizontal and vertical planes!