Which "tweeks" are more important

>>More recently the Brilliant Pebbles have further complicated the situation.<<

Try a little Windex or vinegar/hot water to restore the brilliance.

>>Shun Mook Mpingo disks have had to all be removed<<

I replaced mine with Chop Suey disks; they added a little more flavor to the music. Depends on your particular taste.

Good power and vibration control.

Well we know that ammonia has a purpose. Pebbles on the other hand simply take up space and drain your wallet. But I suppose they serve the purpose of the designer quite well in the latter.