I know I am a bit late to this thread, but have you considered the Mizuno Classic (used to be called Classic Pro Soft) series? The quality is definitely a big improvement over the Mizuno Franchise or MVP series. It is not the highest end that Mizuno makes (Global Elite), but I have been very...
Can't speak to every bat out there, but my daughter's 31/20 CF8 weighs 19.4 oz. and her 31/20 CF9 weighs 19.9 oz. It's hard to imagine that it swings lighter than the -11 CF8s, they swing very light. Can't really say whether the CF9 is as hot as the CF8 yet, because she is still breaking it in...