What is HSR? High Speed Rail?
If I follow my last planing, I will fly from Kunming to Nanchang to visit someone, then take a train to Changsha and a bus to Zhangjiajie. Go back from Zhangjiajie to Chansgha is an option, but only if I could get a cheap flight. Otherwise I would prefer to make my first chinese overnighttrain experience

Edit: Ok will change the direction. Kunming to Huaihua, Bus to Zhangjiajie, Bus to Changsha, Train to Nanchang, Plane to Beijing. Flights from Nanchang to Beijing are very cheap (390RMB + Tax) and I could take a morning flight, so I will only spend the daytime in Beijing. Any advice against this route?

Day1 Arrive 10am Hongkong / Hongkong
Day2 Hongkong / Hongkong
Day3 Hongkong and Shenzhen / Shenzhen
Day4 Arrive Chengdu 11:30 / Chengdu
Day5 Arrive Lijiang 08:45, visit old town / Lijiang
Day6 Lijiang Jade Dragon Mtn / Lijiang
Day7 Lijiang Shuhe, Baisha, Yuhu, nearby villages / Lijiang
Day8 Bus to Qiaotou, start Tiger Leaping Gorge / Tiger Leaping Gorge
Day9 Finish Tiger Leaping Gorge, Bus to Dali ... / Dali
Day10 Dali / Dali
Day11 Dali, Bus to Kunming, depart 16:36 Train to Huaihua / Train to Huaihua
Day12 Arrive Huaihua 9:44, Bus to Zhangjiajie / Zhangjiajie
Day13 Zhangjiajie / Zhangjiajie
Day14 Zhangjiajie / Zhangjiajie
Day15 Zhangjiajie / Zhangjiajie
Day16 Bus to Changsha in the morning, Depart Changsha 11:30, Arrive Nanchang 15:04 / Nanchang
Day17 Nanchang / Nanchang
Day18 Nanchang / Nanchang
Day19 Depart Nanchang 10:45, Arrive Beijing 12:55, Go into the city for one evening / Airport
Day20 Depart 02:00

Could also spend one night in Fenghuang and stay in Nanchang only 2 nights.