OK, so I was having some really bad ghosting/tearing of moving objects on my recorded clips, and I only 3 cameras right now, CPU use less than 50% and RAM use about 2 out of 24 GB so I figured it was more of a setting problem than hardware problem. After reading this thread I thought I might have to get one of those fake monitor plugs, but I already had it set to never turn off the monitor and had it plugged into a monitor that was turned off, so I wasn't so sure about that. I managed to fix my issue by just adjusting a setting.
I'm kind of new to this BTW, forgive me if this is common knowledge. My problem ended up being that I had failed to set each camera up for Hardware accelerated decode: Intel. I did that under each camera menu in Video setting and now it looks a LOT better, pretty much no tearing in recordings that I can see! In the Main Menu settings for
Blue Iris, under Cameras, I had set "Hardware accelerated decode: Intel, but I didn't do it for EACH CAMERA'S indiviual Video menu! So, just putting that out there in case it can help anyone else!