You know I've been thinking about this too. I fish bass up in Maine with swimbaits only. Great bass fishing, but I'm lucky to boat a fish over 6lbs every year. And if I catch 6-10 fish over 4 lbs it's was a great season.
Now to your question. Nothing is too big. Really...I through the BAA, OG wake, 9" slammers, and everything down to the fs gill, shad and baby wake. From my experience nothing is too big, they hit it all. It's really all about figuring out what they're in the mood for, and you're shoulder endurance
From what I have seen, depending on where you're from, the population of big bass, time of year, general environmental conditions, etc. you'll either be blowing your arm out for that one trophy bass over 7lbs, or sticking 6lbrs on baby wakes, it really all depends, but pretty much anywhere there are bass you'll catch'em on big baits. Hope that helps. As for really big baits 14"-16" while I think even where I'm from the bass will hit them I just don't have the shoulder, or the gear to fish such specialized baits.