Interesting... I'm on a GTX 1060 / i5-8300 rig these days so I would've expected your performance to be better than mine. (Bigger numbers means better hardware, right...?)
At least the "GMS2 has better performance than GMS1" result is congruent with my testing - it's not as noticeable when both run relatively stable 60fps but the difference is gigantic - something like 500 fps_real for GMS1 vs 800 fps_real for GMS2.