I love it when people say something can't be done! It only makes me try harder to prove them wrong!
I talked about this topic somewhat at the Pond Boss Conference with the guy that writes for In-Fisherman. (Sorry I forgot his name!) In Massachusetts where I lived as a kid, the locals catch bass that dwarf our Indiana bass even though their water is somewhat acidic, less fertile, and they are farther north than our Indiana waters. In fact, although not the norm their state record is over 15 lbs.! It seems there are other factors involved and I believe it has to do with forage. I was told that state record fish was taken in pond that connects to the sea and has periodic alwive runs (wasn't actually caught where it's listed as) and that body of water produces a few double digit bass every few years. Additionally, bluegills are considered trash fish up there, and there are lots of medium size to larger bluegills that are unexploited unlike in Indiana where they are pressured really, really, hard. We don't even have a bag limit on them. I'm thinking there is no shortage of the size bluegills that anglers normally exploit that are perfect forage size for this behemoths.
And thirdly, trout stocking just about every body of water -- even if it's only put and take is a big deal in Massachusetts. I have to wonder if these large bass are feeding on these 10 inch rainbows.