No, it wasn't a bad idea - once you've ironed out these few glitches you'll never look back. TBH, there shouldn't be any issues you've bought quality components with solid driver support - it's going to be some innocuous glitch which unfortunately is ruining your experience.
For now:
Double, double check that your running at 1440p - stick to native resolutions for now in all games while you're finding your feet. If you are running/using Geforce Experience (i don't use this so not familiar with interface) make sure it's not conflicting with the in game settings - i'm not sure which takes precedence - but
@orbitalwalsh will probably be able to advise on this.
Unfortunately, i'm busy - but fortunately orbital's about - but suspect it's a driver/setup issue.
When i have time i'll re-read the thread - but for now i would update/re-install your GPU drivers - make sure their the latest Win 10 64 bit WHQL version -
Clicky. I don't install the 3D crap - just the drivers.
Double check the desktop screen resolution on your desktop is set to 1440p via Nviidia control panel or Windows display.
I would also reinstall the chipset drivers -
before the GPU drivers.
If this has no affect i would uninstall and reinstall BF1 and the Division after the driver updates - and again stick to your screens native resolution.
Also, as
@orbitalwalsh mentioned, make sure your games are being saved to your SSD - as your load times should be significantly faster. We may need to test your SSD - but your Window's boot time is fast?
You shouldn't need to run in Admin - if your problems persist, and although i don't like the this method, it may be prudent to do a fresh Windows install. If you do this you would need to disconnect your second HDD - and source/backup all your drivers to your second HDD so you can install them quickly when you hook i up after install.
I can't comment on the Gigabyte App - I've never used it but I trust
@orbitalwalsh's judgement on this completely - and from reading it seems to have simplified things for you - re: RGB etc... Although, please don't use it to update your BIOS.
Additional: I doubt you have, but remove any clocks and keep the memory at 2933Mhz for now.