I always ran into issues using electric fans, the factory clutch fan and shroud are king for airflow, not to mention no worrying about wiring issues.
I think ~180-190's are a decent operating temp at cruise. Just looks like idling/stopped are where you are heating up. Most likely because the fans cant pull enough air in. But a few things:
What kind of radiator do you have?
Did you put the jiggle valve at the top? Also why use s sentra thermostat? Get a stock one.
May want to adjust your coolant ratio for less green coolant since you don't live in the north.
This is assuming that you don't have any head gasket leaks into the coolant passages.
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