Over heating questions

really okay why is the 160 bad?
I have an after market 6 blade fan with a fan shroud but its a generic one when i put the 3 core in the fan didnt fit so we got a new one.
It gets in the 210ish range when I m stopped or driving around town. When I move at a good speed it cools down fast. I have a thermostat gauge on the top of the manifold right by the thermostat.
Thanks for the input