Hey full auto you want you temps ideally between 81-86 for photosythesis to occur. Just don't let is stay consistently above 90 or it will kill the plants. As for the curl this usually from heat stress and humidity bro! If your humidity is below 35% for a long period of time they will curl up as well. Some strains are more sensitive than others to humidity but I will also tell you if you get your humidity below 35% during late flowering it will increase trich production as well to protect the bud sites.