No, 78F is just fine... your humidity is on the high end of being ok so do watch that... The biggest thing I would caution you about is the amount of Grow Big you're giving her.... I've used FoxFarm in my soil grows and have always needed to cut that down as soon into flower as possible.... You run the risk of developing a nitrogen toxicity and a lockout if you don't.
Overall, though, you're doing a magnificent job! Congratulations and good luck the rest of the way!