Try a polar bear shave? It was pretty hot up here in Portland for a little while and my shaves during that time were my worst. I tried a polar bear shave towards the end of the wave and it was fantastic for the heat. I know it's gotta be quite a bit worse heat-wise down there but same basic principle.

Also, you said you didn't pay attention to how many times you stropped, maybe you were inattentive enough that you rolled the edge or something? Or even you were tired and off your game enough that your technique was just that bad for the day? Just a couple thoughts.