Hey man, it's kinda hard to give you advice without knowing anything about your rig. This can affect performance more than OBS settings.
I use OBS Studio and record lag free at 1080p 60FPS (check out the channel, in particular the Quake/Wolfenstein vids to see what I mean). You wanna make sure you're using the hardware encoder for recording and your bitrate is set to between 8000 - 12000 (I record at 12000).
I don't use display capture option either. I use GAME CAPTURE and make sure to set it to capture WINDOW ONLY (you can then specify that you only wanna record the window that's opened by the game executable). I've posted a screenshot below of my settings. Hope this helps, if you have any questions I will try my best to answer them for you.
My Specs
Intel i5 3570k
Nvidia GeForce 970 GTX 4GB
8gb RAM
Windows 7 Pro
250GB SSD + 2TB Hybrid HDD
EDIT :- Also, check out the guide on these forums for fixing your channel link on your profile.