Looks like the problem was PEBKAC (seriously I feel like an idiot haha). I had so many Ethernet cables across my desk and didn’t realize one of them was hooked through a 10/100 interface. When I took the original image I was connected to the 10/100 but when I swapped with the HDD I plugged it back into a GigE port. My bad on that.
For what it’s worth it’s blazing fast across the board again 😄