I think you're getting a tad confused fella. Easiest way is just to turn off ALL in game AA. Then just use SMAA in the sweetfx settings, which is how my config is set anyway.
Also, I think this new reshade injector that's part of some sweetfx configs now including gta5 is more taxing now than 'old' sweetfx.
I run the game at a locked 59fps now using a framerate limiter with the monitor refresh set at 60 though on a pair of 780Tis which can handle it with ease. It's a weird one GTA5 running on a rog swift with gsync. As usual nothing is simple when it comes to SLI and gsync/ stutter issues. If I run the monitor at anything other than 60hz I get little stutters (ie 85, 100, 120 or 144hz causes microstutters). If I don't limit the fps to 59 I get little stutters. Weird I grant you, but doing what I do makes GTA5 perfectly smooth.
It is just beautifully smooth the way I have it now, totally stutter free and I'm pretty much at max settings. The more I play this game the more impressed I am with it all, including the visuals and the performance. Devs did a fantastic job on the pc version for once!!