God of War II HD [NPEA00256]

Questions about this one.

1) Disk states to support native 1080p (1980x1080), but in 1080p there is constant flickering and wrong display size in Vulkan\GL. In DX12 logos run ok, but freezes after.

2) Core i7-4790 (HT), GTX980. CPU is always <= 50% as if it doesn't use HT. Why?
GPU <=25%. Given this, frame rate drops to 40+, average 50. What is the bottleneck?

I'm new here. Do developers read this?