You have yet to post a log with any sort of proper streaming/recording attempt in it, these two are are almost entirely blacklist spam because one of your game capture sources is trying to hook chrome.exe.
Other problems:
1. One monitor is hooked to the iGPU. Hook it to your 1070. Get an adapter. If you are absolutely unable to hook it to your 1070 then you can't put the OBS window on the second monitor, and can't capture anything from it, without taking a performance hit.
2. Your monitors are only 60 Hz. You talk about how your frame rate drops to 60 FPS. I assume this means you're running without vsync or any type of frame rate limiter. This is going to max out your GPU and cause frequent OBS performance issues, because OBS needs some of your GPU power to work too. Turn on vsync or cap your FPS so that the GPU doesn't max out.