I dont understand ?? You have a hypertech and set the thermostat for 160 but u dont have an aftermarket thermostat?
Did u mean you dont have an aftermaket thermostat and u set the Fans to activate at 160 degrees?.

You should actually set the fans to kick on at 170 at the earliest. Unless it is really really cold it'll always run at 170 degrees or warmer. You should get an aftermarket thermostat for 160 because if its at 180 the fans setting at 160 or 170 arent really helping a whole lot plus thermostats are like what 10 bucks?

Get cold air induction if u dont already have it, do a throttle body bypass on the coolant too if u havent yet.
When your slowing down after the 1/4 pop the hood.. temp will drop pretty fast with all the air rushing in there.. just make sure your latch works properly so your hood doesnt fly off.