Most likely it's the "cheapy chinease water block" causing problems with your flow.
Good block manufacturers will make sure the flow moves all the around the block, regardless of orientation.
Build: msi C8r (Carbon8r)
Core i7-9700K, MSI Z390 GAMING PRO CARBON Mobo, AMD Radeon VII GPU, Corsair Vengeance RGB 32GB DDR4-3200 RAM, Phanteks Enthoo Pro M SE ATX Case.
XSPC RayStorm Pro CPU w/b, Bykski Radeon VII GPU w/b, EKWB 140 Revo D5 Pump & Rez.
Aquacomputer Aquaero 6 LT USB Fan-Controller, Vision Touch and 'High Flow' Sensor.
(2x) Hardware Labs Black Ice Nemesis 280GTS XFLOW radiators in full push/pull with 6x Deepcool RF 140mm & 2x Prolimatech 140mm Slim Fans.