I looked at your temperature forecast online..love your temps! Wish we have that, we are soaring 20 degrees higher than that at the peak of the day. Temperature-wise, you are right when you say your lavenders should be okay with it. So if temps are okay, sun is okay, then maybe it is the frequency of watering. Agree, do it slowly, and observe if the plant perks up after getting watered. Good luck!
