Are there shaved/rolled bats? There are a few that use them in league play however there are homerun limits put in place that negates the team with the "120 lb men" hitting 300' ft bombs. With the HR limits, runs limits, and ball compression restrictions there are not any "50-40" slowpitch softball games. Most tournaments have bat testing and even in league play if you hit the pitcher your bat gets tested.
Everytime I hear the someone complain about how hot/shaved/rolled the bats are now I just smile and nod. It's usually an old timer talking about how much tougher it was in the "good old days" to hit homeruns. (Funny how they don't mention the differences in ball compressions).
The only way you will see a "50-40" slowpitch game is if you go play in an unsanctioned roundrobbin where you are hitting your own balls (harder compression) with your shaved bat. That is not slowpitch softball.