Definatly don't use xtra shine, as that stuff really makes equipment skate through the heads. Just a quick possibility as to why the disparity between 4000 and 2000. If you didn't knock the polish off the ball first, the 4000 may not have been enough to get rid of the oob polished finish. Then when you finished to 2000 grit, the polish may have finally been removed, hence the monster reaction. If that is not the case, personally I'd reccomend some sort of lower grit + compound type finish.
If you have rough buff from brunswick, you may want to start with either a green pad (approx 600 grit) and add rough buff, or go with a grey pad (approx 800 - 1000 grit) and RB. I have heard people that have had success with a 3M compound also, but I have personally not tried it.
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