FPS problem

I have troubles with fps on AC. When playing with Oculus I usualy get a 44FPS cap on almost all races, except if i practice alone, or i race against max 3 or 4 CPU\Sim drivers. Without Oculus verything works fine on an old 1680x1050 monitor.

First of all my cfg:
i7 960 @3.2Ghz
GTX1070
12GB RAM
Oculus Rift
Logitech GT Force PRO

FACTS:
- When I got this FPS cap GPU is working on a 50% load.
- When i get over this cap playing alone and having 90FPS GPU is working at 80% load as it should.
-...

FPS problem