There's so much more to it than what brand/model of radiator you have.
What PSI is your radiator cap rated for?
Is the cap new or clapped out?
What temp does your thermostat open at?
Are you even running a thermostat?
What proportion of water to antifreeze is in your system?
How are your electric fans being turned on? (computer, rocker switch, or temp probe)
If its a temp probe, where is it measuring from?
What CFM are your fans?
What's your shroud look like?
Does it run hot if you're just cruising at like 45mph at a low RPM? Or does it only overhead when you are sitting and idling, or when running it hard?
In my experience, running with no thermostat makes the car tend to run cooler, and not even get up to the normal operating temp, unless you really start hossing around, then it can overheat.
Pure water transfers heat better than antifreeze. Trade off is that pure water also freezes easier. That may not be a concern in florida.
If the car stays cool while driving but overheats while idling, the radiator is fine but the cooling fans are not doing their job.
The closer you put a temp probe to the return inlet of the radiator, the more time the fans will spend running and cooling the water. Its a trade off of getting adequate cooling but not having the fans kicking on and off constantly.