I've not used the Reference, but I've had two Deccas since the early 80s. Damped unipivots were the conventional choice; I use a Hadcock. These compensated for the lack of vertical compliance in the Decca design. Air bearing arms should also do the trick as they aren't rigid in a vertical plane either.
Charlie
www.charlie-chan.co.uk
Charlie
www.charlie-chan.co.uk