I can confirm you words:
Ryzen 7 3700X
all-core locked@4GHz(undervolt to 1.185v/@75w)
DRAM@3600CL16
@Win10-1903
8700h/s with 5.1.1 (the same for compiled 5.2.0 dev. revision - is not in public yet)
As it is not a topic about xmrig non-public code, do you have maybe hashrate report from RagerX on the same CPU to share here?