Secondary displays stuttering

[WhatsAComputer]

Monitors:
Main: 27" Samsung OLED 360hz
Secondary: 27" Acer LCD 144hz
Secondary: 42" LG C2 OLED 120hz

PC Specs:
AMD 7800x3d
3080 TI
64 Gb RAM

Context:
When playing multiplayer games use the 27" OLED as my main screen set to 360hz. I use the 42" monitor which sits above main monitor as a twitch, youtube, movie monitor while playing games. I then have the secondary 27" Acer monitor as a discord, browser, and oldschool runescape monitor. With my use case I almost play exclusively in borderless fullscreen when gaming.

When playing most games on the 27" OLED at 360hz my secondary monitors will have severe lagging/stuttering. I have tried disabling hardware/graphics acceleration on all apps, browsers, etc. I also tried using GSYNC but this doesnt appear to resolve the issue. I am also very sensitive to the flickering caused by GSYNC so I prefer it off. Within the NVIDIA control panel it also has options for 240 and 120hz. I tried 240hz and experienced the same issue. I tried 120hz and that appeared to resolve the issue. I obviously dont want to play at 120hz with this expensive monitor. Also, doesnt running monitors at a lower refresh rate than its native cause frame issues?

I am not knowledgeable at all when it comes to monitors. I usually make my decision based on reviews from RTINGS and youtubers since I do not have a good place to see monitors in person and wouldnt know what to test/look for. I was struggling to find info until I came across a video where they mentioned issues with multiple different framerates but didnt expand on it much. I figured this may a good place to get additional information.

Luckily, I am still able to return the monitor if this is something that cannot be resolved. If thats the case, do I need to stick with something around 170hz as a new monitor?