I'm no Brunswick guru but I had the Green/Black Pearl. It's the PK 18 pearl but the core has a very limited differential. I found it to be exceptionally smooth even though I am rev dominant. The same cover on the Karma pearl with a larger differential had a much stronger backend.
Unless you force the Green/Black Avalanche with an extreme flippy drilling and maybe extra polish or unless yo are extremely rev dominant, I think the ball will remain RELATIVELY even reacting, when used on the appropriate amount of oil.
That said, with 25' feet of sanded backend, even I wouldn't start with a polished coverstock, unless it were urethane. Start with at least 4000 grit and a pin under drilling, UNLESS you are speed dominant.