Your not using a cool tube so do the back of the hand test, hold your hand above the top of your plant for 10-30 seconds, if it feels warm move the light up an inch and try again till you have no heat. You don't have to much stretch so you could move light little higher if you feel the need regardless of heat test.
it looks a little like its curling but not serious, if your humidity is ok just get some ph balanced water at 6.0-6.5 and mist your plants with it once a day, top of leaves and bottom, they will absorb the moisture. Believe me I have much worse heat swings at the moment and plants don't take long to recover from changes in temps, if you can control it better of course but if not don't stress if it's only minor, major heat stress will look like this
View attachment 2947161View attachment 2947161