question about connecting times between CRH trains

Have identified a Fuzhou to Nanning schedule option for travel in late April. This would involve four separate trips. My question is whether the connecting time between trips is sufficient to make connections. Times are:
G5305 Fuzhou 11:30 Xiamen-Bei 13:15
D2345 Xiamen-Bei 13:27 Shenzhen-Bei 17:08
G6024 Shenzhen-Bei 17:29 Guangzhou-Nan 17:58
D208 Guangzhou-Nan 18:30 Nanning-Dong 21:49
I have ridden CRH rides many times and understand the station and processes. Should I go ahead and book these 4 rides, or is the connecting times between trips at Xiamen and Shenzhen too tight to make connections/