I feel sorry for you if you've only got Bahia to cut! That stuff is a pain to mulch, especially when it gets a foot tall. I use Gator G6 blades and double cut to achieve a decent cut, and this is on weekly yards! I probably wouldn't be in this business if I didn't have St. Augustine and Zoysia yards to even things out.
You need to try the G6 Gators. The cutting edge is infused with carbide, it lasts longer than the edge on a standard blade.