I dont play this game but the official thread has a few things to note (although admittedly not directly to your issue):
The PAL version of the game requires you to enable the 'Use EURGB60 mode' found under config-->Wii
Your rig looks more than fast enough but there can be stuttering/cutscene issues, so try disabling Idle Skipping
You can always try to old tried and true:
Try disabling cheats and avoid savestates. Load from a memcard save. If that doesnt help, try disabling dual core (kind of stabbing in the dark with this one). If it is still an issue, try redumping your game. If it only happens in this game and happens in the same places, it may be a bad dump.
The PAL version of the game requires you to enable the 'Use EURGB60 mode' found under config-->Wii
Your rig looks more than fast enough but there can be stuttering/cutscene issues, so try disabling Idle Skipping
You can always try to old tried and true:
Try disabling cheats and avoid savestates. Load from a memcard save. If that doesnt help, try disabling dual core (kind of stabbing in the dark with this one). If it is still an issue, try redumping your game. If it only happens in this game and happens in the same places, it may be a bad dump.
i5-8600K @ 4.5 GHz
GeForce GTX 1080 SC2
ASRock Z370 Taichi LGA 1151
CORSAIR Vengeance LPX 16GB 2400 DDR4
SAMSUNG 970 EVO M.2 500GB PCIe SSD
Indigo Xtreme TIM
Phanteks Pro ES614P Black Steel Case
EVGA SuperNOVA 750W PSU
Windows 10 64-bit
GeForce GTX 1080 SC2
ASRock Z370 Taichi LGA 1151
CORSAIR Vengeance LPX 16GB 2400 DDR4
SAMSUNG 970 EVO M.2 500GB PCIe SSD
Indigo Xtreme TIM
Phanteks Pro ES614P Black Steel Case
EVGA SuperNOVA 750W PSU
Windows 10 64-bit