Recently I have bought a 144hz monitor (XG2401) but have been unable to reach a constant 144fps in overwatch (usually around 120 sometime 130fps with dips to 110) with a gtx 1070 and i5 6500 even at what I'd consider relatively lower settings:

Borderless Windowed
1920 1080 (144)(*)
Fov: 100
Vsync: Off
Triple Buffering: Off
Reduce Buffering: On
Limit Fps: Display Based
Render Scale: 100%
Texture Qual: Medium
Texture Filtering: Medium - 2X
Local Fog: Low
Dynamic Reflections: Off
Shadow Detail: Off
Model Detail: Medium
Effects Detail: Low
Lighting Qual: Low
Antialias Qual: Medium - SMAA Low
Refractio Qual: Low
Local Reflections: Off
Ambient Occlusion: Off

To me at least this would seem like lower performance than is to be expected, am I possibly experiencing a cpu bottleneck or some other issue? Or am I just being unreasonable as to the performance I expect from my hardware? Finally, if I am experiencing a bottleneck or issue what could I do/upgrade to fix this?

EDIT: Upon request from /u/Masked__ I ran the userbenchmark.com benchmark and my results are listed below in case it might help anyone.

UserBenchmarks: Game 90%, Desk 55%, Work 43%