So, as the title suggests I am having some performance related issues that I could really use some help with; also I am by no means tech savvy at all so I apologize if some of the information I am requesting is common knowledge, or if I don't fully understand what you may be asking me to do.
My computer was a pre-built (yes I know some of you just died inside) and was purchased in mid 2017. It is running
I7-7700k OC to 4.75
GTX 1080
16g 2400 Ram
I've always had extremely long boot times (my OS was on a HDD) so a few days ago I purchased a SSD Samsung Evo 860 500GB and a Samsung M.2 970 Evo Plus 1TB. After literally an entire day of youtubing and googling how to install and setup everything I was finally able to boot on my M.2 with a 5 second cold boot time so yay there! However, I noticed that my computer does not recognize my second monitor anymore. I have tried updating my graphics driver and reinstalling them but it doesn't work and nowhere in any windows setting can I even see my monitor being recognized. So, some help there would be appreciated, I'm sure it's something small and stupid.
MY MAIN CONCERN of performance comes from in game. I mainly play WoW and OW and I know my hardware should be more then capable of handling those two. Earlier this year, I started noticing a drastic FPS decrease in both games as well as noticeable screen tear right down the center of my screen in WoW in certain areas, and consistently in those areas (I.E Maldraxxus and Plaguefall, as well as EVERY load screen). My FPS also tanks significantly while this is happening, dropping as low as 30-45 FPS while the screen is tearing and then goes back up to 120-144 FPS when the screen has no tear. I did some research and thought maybe it was an overheating problem, so I went to my local Micro Center and talked with some guys there. Now, 100% I know they up-sold me but it made sense to me. They recommended liquid cooling (NZXT Kraken x62) a new case (Lancool II Mesh) and they were also the reason I got the M.2 as well. I installed all of this, including switching the case and parts over, on my own but I noticed no difference. I still get screen tear and big performance drops in those areas (there are other areas, those are just the two that come to mind).
I looked through my BIOS and noticed that my CPU is running at 82-86 degrees, which seems really high for pretty much being idol and having 6 fans in the case and liquid cooling (I also just reapplied fresh thermal paste prior to installing the new liquid cooling). My SSD and M.2 are at 20 degrees and my graphics card is around 60 degrees. So I'm not sure if my issues are still somehow an overheating issue or if it's something else. I apologize about the wall of text, I just wanted to give as much information as possible. I appreciate anyone who tries to help!
Edit: Did a restart on my PC and my temps seem a lot better, however I am still having issues with FPS dips and screen tear in those areas. The attached screenshot is taken from NZXT Cam while inside Plaguefall.
In-game, inside Plaguefall with screen tear and FPS dips
https://i.imgur.com/dM1IcNx.png
Idol with only discord running
https://i.imgur.com/61ZOl2L.png