That's absolutely hard. I just follow what Dori chanted in Finding Nemo 'keep swimming...keep swimming' but change the last word by 'trying'.
Generally, the Lavenders are not well suited to the humid tropical region, mostly where I live in Bandung which so rainy and so humid and hot in dry season.
I have dilemmatic situation here, too much water will kill lavender, they hate wet in their root system, but heat will also dry them to death.
Time to time I have kill so many lavender, baby lavender, young adult lavender, they were all now rest in peace. Mostly because of too much love, eh I mean too much water or no water, when I have to go out of town. They will gonna wilt for about 2 days without water. Oh my poor lavender.
Here are some of the lavender those can survive so far. I have some English Munstead Lavender, Lavender Stoeches, Lady Lavender, and Blue Provence Lavender. Wish me good luck. I really hope so. Cross my finger.