Truck 5.3 Thermostat

[Houston Ben]

Hi all,
I have a 2011 5.3 was running it with water for a while with stock thermostat. I recently bought a new thermostat and filled engine and rad with 50/50. Now the engine runs hot, up to 230 if I am going 80 mph. With the old thermostat is stayed between 190-200, does anyone know why this would be?

Also, the new thermostat was a lot longer than the stock one (still fit) but it is supposed to be a direct replacement, anyone else have a problem with this?

Ben