I use the Micro Smooth on all my CDs, new or used regardless of the age. I have also found that the harder you scrubb (and longer) the better the results. Be careful though to rinse the CDs VERY thoroughly. I basically use all the other Mapleshade tweeks and feel that the results are cumulative. I also use the Optrix in conjunction with a Bedini defluxer. The rotation of the Bedini unit uniformly applies the liquid and results in an audible improvement.
In addition I use the Denon Demagic disc to remove system magnetic build-up.
I know this can sound a little weird, but if you have 30K + in your system... details do matter.