Managed to improve my cable management and gave the case and fans a bit of a clean, temps tend to load around 74-75 now and generally sits around 55 idle with my CPU @ 4.4. Pretty pleased with it now.
Nice job on the cable tidying, only problem I see with you card is the high idle temps still, it should be idling in a 21c room temp room around 35c, if room temp is lower below 35c. I have the same card as you and it does not get any higher than 38c when the central heating is on and the room temperature is high.
I would ask the person you purchased the card from if they have removed the cooler at some point and added new paste, they may have done a bad job of it. (may need to renew paste and installing right again).
Are you also 100% sure there is nothing on your system using the graphics card when in idle (as you noticed Xbox DVR was causing your browser to crash the nvidia drivers), like the nvidia experience rubbish that captures video etc. Have you tried without the Nvidia experience too ? Also any other software that auto starts that could be using the graphics card. Also check for a virus too, maybe you have the bitcoin virus that will use your graphics card too and make it idle higher temps.
What would be nice is if you can restart the system kill any tasks not related to the OS or drivers in task manager and run gpuz and let it idle for 10 mins and take a screen shot of the sensor page and the graphics card page so can see what it is set at at stock and what VBIOS it is on, you may need to update the VBIOS or the person before you has installed some other VBIOS.
Also on the card have you checked that the card is set to Normal not OC, there is a switch on the card near the power cables make sure it is set to Normal and do this while the system is off. Then if it was on OC check the temps again for idle.
Also can you supply system temperature, cpu , motherboard etc. Screenshots please mate so we can resolve this issue for you. Because it is not normal for a Classified to idle at over 40c doing nothing even in a really small case with bad airflow. (your case is great, but I would add a side fan and more intake fans to create a positive pressure and that will reduce dust build up too). Even when you had the case open yesterday your temps were still high, so it proved it was not the case doing it.
Also do these tests above set at 60hz refresh rate, 120hz and 144hz. Because it could be a refresh rate bug you have. Set the refresh rate in the nvidia control panel where you set your resolution. Also check them in windows , by right clicking the desktop and selecting screen resolution and selecting advanced settings and click the monitor tab to check what the refresh rate is set at, 60hz may show 59hz, 120hz may show 119hz, and 144hz may show 143hz there so don't worry.
Dice also owns a Classified, can he also check his idle temps on the stock air cooler.
Mine is sat at 30c in a cold room right now at idle with Skype and browsers open on the stock cooler for the classified. you want it to be 35c to no higher than 39c in a warm room.