If you are looking for a different blade, I've had good luck with a HD clutch and a FAL metal replacement blade. I live in So AZ, which might be comparable to your hot So-Tex climate.
That said, I would agree with going electric if you dont already have a new fan clutch (they're pricey, and that money could go a long ways towards covering a junkyard Mark VIII and quaity fan controller).
Good luck.