NAND sync does not exist outside of 652 so that is impossible for OP to play netplay. Your settings look fine, check out this gpu section of this guide, it applies. https://forums.dolphin-emu.org/Thread-unofficial-laptop-performance-guide
[color=green]Windows 7 x64 / i5 4690k @ 3.5 GHz / GTX 970 / 8GB RAM[/color]
