A lot of you seem to be using products that have Oppo transports. Is it the same drive as used in the Oppo 103/5 203/5 blu-ray players?
If so I highly suggest checking out Oppomod.com as they sell a stabilizer plate mod kit for those drives. The improvement was pretty incredible with disc playback.
It’s a fully cnc machined kit that just bolts onto the top frame of the drive, which usually is easily accessible in most transports.