CPU and GPU not utilising all resources

Dec 17, 2018
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Hi all i have this weird problem where all benchmarks give me satisfactionary results yet when gaming my CPU and GPU is barely utilising 40% of its resources.
One example would be x-plane where i would get 80fps benchmarking in 4k all maxed out and utilising my hardware to maximum yet when gaming i would barely get 20fps with the same configiration and in the same area as benchmark.
Another would be GTA 5 where fps would not drop below 30 and would stay usually at 60 when benchmarking in 4k all maxed out, utilizing all resources yet the same scenario when actually playing the game barely 20fps and 40% of utilization.
I would get 4250pts in extreme time spy in 3dmark and 1100pts for CPU in Cinebench.

No overclock
Temps would stay in around 60 for both CPU and GPU in all scenarios
Brand new build, reinstalled windows

My Rig:
ASUS ROG MAXIMUS XI HERO
Intel Core i5 9600K Unlocked
G.Skill Trident Z RGB 16GB (2x8GB) 3200MHz DDR4 on XMP 1 profile
ASUS NVIDIA GeForce RTX 2070 STRIX OC 8GB
500GB Samsung 970 EVO M.2 NVMe SSD
650W - Corsair CS650M 80+ Gold Modular Power Supply
TV : Philips 49PUS6401/12