I grow in the desert could be 120° during the day and 70° at night. I'll also grow down to 36°. Once they start flowering they'll stretch, applying nitrogen to aid in quick plant growth helps or splitting veg/flower nutrients whereas you're covering both. The stretch and the transition. Once that stretch is over stop veg nutrients for flowering nutrients. Veg is higher in nitrogen flower higher in phosphorus and potassium. When plants start budding they'll shoot white pistils ( females ) when plants start maturing those white pistils will change color, become darker in color generally red, brown, orange. Once the majority of pistils have darkened, pistils will start to curl. Almost there shortly after this time generally within several weeks buds will swell, and those pistils will recede into buds. plant will be mature, ready for harvest.
Drying depends more so your environment, you want to achieve a 10-14 day dry imo less up to 7 is okay anything less than that is too fast imo. Dialing in the perfect dry could take a couple to several attempts. Easiest way is in a sealed environment like a tent, where you have complete control over drying environment. Some like the 777 method 70° 70% humidity for 7 days. Imo drying conditions should be cooler to help slow down degradation. But that method will work fine.
Once dried, buds feel dry stems snap but dont break it's time to cure. any air tight container with a hygrometer. If dried properly shouldnt need a humidity pack for a week maybe up to a few weeks. Also depends on container size and amount of bud. Once hygrometer reads 62% or less is when I add a humidity pack since that's the % of humidity packs used. A month like that you're good to go, 3 months even better. If hygrometer reads like 70% or above dump buds out and let dry for about 15 minutes. If hygrometer reads between like 67-69 just pop the top for about 15 minutes or exchange jars whereas buds that were on bottom are now on top. If humidity is between 63% and 67% personally I'll leave it sealed. If dried properly humidity should be below 67% but above 62% maybe a tad below 62% if over dried and hygrometer reads below 62% add humidity pack immediately. Depending on jar size and humidity pack size possibly 2 humidity packs would be needed. Depending on how over dried buds are. Hoped that helps good luck bud. Plant looks excellent for your first attempt, pictures of issue would help by those pics provided can't say theres anything wrong
Purple stems can be normal
Whilting could be slightly underwatered In heat. Pictures would explain a bit more
