Lived in Miami and Clearwater for 13 years and know your pain +. That heat, crime, rude people and the crowds drove me out.
Here are my recommendations coming from a sweat monger who's Springer 1911 is corrosion free:
First thing to do is to treat your CCW with Militec-1
MILITEC-1 - The ONLY all-purpose synthetic metal conditioner and gun oil. I've promoted this product for the last 2 years and it is THE best metal conditioner out there and WILL prevent your gun from rusting If you treat it as instructed and give it a regular wipe down.
Second is to wear a tucked in shirt for a barrier. It'll keep skin abrasion down from the leather and soak up much of the sweat. I always wore a unbuttoned shirt over the top but with a good tuckable from HBE Specialty Leatherworks (my favorite) holster you can go without the outer shirt, though it does do a better job concealing a large CCW.
H.B.E. Specialty LeatherWorks
Last is to buy a quality holster and belt. A good one is chemically sealed and treated and should provide you with years of service.
Regards,
Roger