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Turn off vsync and any frame limiters.
Have you checked you're not maxing out on the CPU or HDD? Either of those would cause slow down and force the GPU to drop load.
1070 here but same game and res. I am pretty much always at 100% GPU usage and CPU usage is high as well (6600K at 4.6ghz), normally around 80% but can hit 100 at times which then can drop GPU usage a little down from 100%
Check the amount of pre-rendered frames (people usually set it to 1 globally but this causes games like gta not to utilize the gpu fully).
I need v sync on for my monitor.
What setting are you on mate?
What frame rate are you actually currently getting? What's your monitor refresh rate?
Not everything is maxed at all. My monitor is 60htz. I will turn v sync off tonight and post results.
The thing is why do I have to turn settings down to stay at 60fps if I'm not using all of the gpus power?
Check the amount of pre-rendered frames (people usually set it to 1 globally but this causes games like gta not to utilize the gpu fully).