Setting the monitor 144Hz and then limiting the framerate to 120-135 depending on taste with G-SYNC on isn't a bad thing to do - depending on game and setup it can produce the lowest input latency while removing tearing.
I've got a feeling the problem the OP is having is that either the games in question aren't going into fullscreen mode properly for some reason or they use "fake" fullscreen modes like borderless window mode which don't work with the normal G-SYNC settings.
You _can_ use the window and fullscreen G-SYNC setting to work around this but it can cause compatibility issues if left enabled with some desktop stuff.
EDIT: Reading up on D3 there are a lot of people who have problems with G-SYNC and the game - the solution for most seems to be to enable vsync in D3 itself and select native resolution and a refresh that is a multiple of 60Hz i.e. 120Hz in the game and then in the nVidia drivers under Manage 3D Settings->Program Settings find the profile for D3 and change the Preferred refresh rate setting to application controlled - apparently 144Hz + G-SYNC does not work for most people in the game.
In game turn VSYNC ON and select a resolution with 120Hz refresh rate.
I've got a feeling the problem the OP is having is that either the games in question aren't going into fullscreen mode properly for some reason or they use "fake" fullscreen modes like borderless window mode which don't work with the normal G-SYNC settings.
You _can_ use the window and fullscreen G-SYNC setting to work around this but it can cause compatibility issues if left enabled with some desktop stuff.
EDIT: Reading up on D3 there are a lot of people who have problems with G-SYNC and the game - the solution for most seems to be to enable vsync in D3 itself and select native resolution and a refresh that is a multiple of 60Hz i.e. 120Hz in the game and then in the nVidia drivers under Manage 3D Settings->Program Settings find the profile for D3 and change the Preferred refresh rate setting to application controlled - apparently 144Hz + G-SYNC does not work for most people in the game.
In game turn VSYNC ON and select a resolution with 120Hz refresh rate.
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