Yea half strength, fine mist as possible and only lightly spray, if they get wet you did too much..if its a severe def. The leaves may become splotchy where the droplets hit, its cool wait for it to dry bout 20 min or so and hit it again. Damaged leaves won't recover but you would be surprised what you can keep green by spraying....don't put under lights for at least 45 minutes and they must be out the light, not backed off or dimmed.......again fine mist is much more effective just going into the pores rather than large droplets snapping shut the stomata and just dripping....
N def leaves don't go crunchy, they become like fabric as they yellow...crunchy is overwatering....are you using any form of h202 etc