Thanks for the clarification BeachKitten. Because time is meaningless and math isn't my strong suit, I was actually incorrect about my situation. My tests were indeed taken within the 72 time frame from my connecting Miami flight. Got my results back this morning (so less than 48 hours for those following) and I submitted my application. I'll do a separate post to share my travel experiences once I'm actually on island where I'm supposed to be (fingers crossed).