When I was at Homestead AFB, there was s storm that blew in some little Haitiian skeeters that were real bastards. We’d slather on the repellant, but it didn’t work well. If you leaned on a jet and left a sweat mark, the skeeters would land on that to investigate. It was in the ‘80s, so there were plenty of jokes about them carrying blood from gay Haitiian junkies.
IIRC, Ultrathon by 3M was originally tested in the Caribbean. Lower DEET (34% lotion), it is formulated to last longer than regular DEET spray when perspiring. I’ve used it for years, alternating with Picaridin in the past couple of years. Both have great reviews.