New Computer, New OS, new everything, same mouse input stutters

[labree0]

As of this past weekend, input from my mouse has been stuttering. My frametimes are rock solid, but my mouse input seems like its dropping every other poll or something, and when moving the camera in game, this translates to a sensation that the game is stuttering. If i use a controller, the camera movement is perfectly smooth, with no issues.

On my old computer I had the same issue. I nuked that computer, and installed both a new windows OS, and a older version of windows, using Rufus. Both had the same issue.

CPU: Intel Core i5-10400 2.9 GHz 6-Core Processor (Purchased For $159.00)
CPU Cooler: Cooler Master Hyper 212 EVO V2 62 CFM CPU Cooler (Purchased For $40.00)
Motherboard: Gigabyte B460M AORUS PRO Micro ATX LGA1200 Motherboard (Purchased For $99.00)
Memory: Silicon Power SP016GXLZU320BDAAD 16 GB (2 x 8 GB) DDR4-3200 CL16 Memory (Purchased For $64.79)
Storage: Silicon Power A55 256 GB 2.5" Solid State Drive (Purchased For $27.99)
Video Card: EVGA XC GAMING GeForce RTX 3060 Ti 8 GB Video Card (Purchased For $0.00)
Case: Fractal Design Meshify C ATX Mid Tower Case (Purchased For $0.00)
Power Supply: EVGA 600 W1 600 W 80+ Certified ATX Power Supply (Purchased For $0.00)

I used a different mouse (wired and wireless), a different mousepad, unplugged everything else, used different usb ports, front and back of computer, and all had the same issue. There are no devices near my computer aside from some smart bulbs.

My new computer has the exact same issue. Same stutter sensation across multiple games. (helldivers 2, god of war ragnarok, repo, overwatch)

CPU: Intel Core i5-13400F 2.5 GHz 10-Core Processor ($134.94 @ Amazon)
CPU Cooler: Thermalright Peerless Assassin 120 SE 66.17 CFM CPU Cooler ($34.90 @ Amazon)
Motherboard: Gigabyte H610I Mini ITX LGA1700 Motherboard ($129.99 @ Amazon)
Memory: TEAMGROUP Elite 32 GB (2 x 16 GB) DDR5-5600 CL46 Memory ($69.98 @ Amazon)
Storage: Silicon Power A55 1 TB M.2-2280 SATA Solid State Drive ($48.97 @ Amazon)
Video Card: Gigabyte GAMING OC Radeon RX 9070 16 GB Video Card ($689.99 @ B&H)
Power Supply: Thermaltake Smart BM3 850 W 80+ Bronze Certified Semi-modular ATX Power Supply ($99.99 @ Amazon)
Custom: Okinos Wood Design Micro ATX Case, 4 × 120mm 3 Pin Non-PWM Case Fans Pre-Installed, Temper Glass Side Panel, with Type-C, Black, Cypress 3 Wood ($61.99 @ Amazon)

I did a fresh install not using rufus, from a different usb drive, and the issue persist. Prior to this weekend i had no issues at all, other than some initial issues with my 9070 that i have since worked out.

I have latencymon, but i dont really know how to use it to generate useful data. if someone can point me in the right direction with that, i can provide information that might be more helpful than just what I've laid out here. I do have mousetester as well, but the reports from it look normal. The only thing i haven't tried as of this point is a different monitor, but thats because its its own whole PIA to hook up. is there anything that could have changed over the weekend to cause this? Its like i went from perfect and smooth to stuttery overnight, and now nothing fixes it.

I attached a screenshot of my latencymon
I think i saw it mentioned that the lower the ISR routine is, the better, but mine is almost 40 times higher than some of the others i've seen. No idea if thats the issue.