strange leaves...

hey, i have some problems with humidety in the dark period.the leaves curl severly at the ends making an o shped tip espesaly the small ones the big ones just curl, and they are misshaped wobbly and contracting along the length of the leaf.budding slowly and wide appart 5 weeks in bloom,humidety?have the humidety at night something to say for growth at day? at day it is about 40% at 74 degres but at night it rises to 70% at 64 degrees. i know that humidety is relative and that it rises when lights go off. but will it be the same amount of water in the air at day and night in my case.and if, is it okay? i have proper ventilation in and out and a controller for temp and humidety outside its about 50f+-5f and about 35%.the plants looks nicly green have the desired higth take away the misshaped leaves and slow growth its looking good. i wathering every second hour for 15 min when ligts on and one time two hour into darkness for 5 min. using hydro with Hydroton round rocks made for this purpuse.growing cheese.i appologise for the spelling im high and from Norway. i would be greatful for some of your knowlege!



ph:5,8-6,2
ec:2000 watertemp around 66f

it would be really hard for anyone to answer with only that amount of info, but from my own experience I can tell you, you really want to get that humidity down. It especially becomes important the last few weeks of flowering when the buds are really big. 70% you are really looking for mold, especially indica strains with huge buds. try your best to fix that before it gets too late.
peace