Overheating after Thermostat Change out

Okay. Replaced the 195 with a 180 thermo (which I tested first and it worked)

It sorta kinda fixed the heat issue. Instead of it running around 90% on the stock gauge its now in the 50-75%.

Originally it only ran in about 25-40 range.

What gives? Is 50-75 normal and or Okay?
Thanks so far for your help it's really appreciated.