Hey guys, I appreciate all the responses received. I tried the Platform sized for my heavy Wadia DAC which was an improvement but found more reward placed under the Oppo. There is a 10Kg weight difference so I added that amount to the top of the player which brings it to the middle of the recommended range.
I had the Oppo on Isoacoustics so listened with them removed and this reaffirmed my impression that they were helping only a little, certainly nowhere near the Townshend Platform performance. The sound was immediately more relaxed and detailed as would be expected from a lower noise floor. My 7m x 5m room is well treated acoustically so we were hearing more of the venue. Great fun. Impressed.