The trip I spoke of was from 2010. All diving was all within an archipelago in 20-60ft of water and a constant 85-95 deg. F. Clarity was 40-60 ft depending on tide and location. Tons to see just like many other spots that far south. I would say that your location would provide the same or even better. In Bocas, all islands drain into the sea water and cycle out with the tides. In my opinion they are ruining the clarity in the area and need a contained sewage system for the islands and coastal towns but the $$ is not there. It is still far better than average but I bet 20 years will have a dramatic negative impact as tourism grows and faster than they can upgrade water protection systems and regulations.
Hope you have a good trip!