By far 5,6, and 7 have to be my top choices to hunt black bear. If you like 7a you need to head West into 6 it gets even better in my opinion for both fishing and bear hunting
A heads up for anyone wanting to try regions 6 or 7 take your time to look at the bear before you shoot because I have seen some of the biggest bears in these regions but also some of the smallest. In my opinion this is due to the number of sows with 3-4 cubs in these regions.