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Hello, how much did you add? has it been overheating? does it run higher than 1/2 way?
Likely not air in the system, The overflow ONLY works and draws coolant from it as the car cools down, as it it almost cool? it then draws from the overflow. 1/2 way on hot day is still in normal range, a little higher in traffic and AC on is normal also, I am not looking to see how high on the guage it goes, but.. I am thinking you may> have weak thermostat, I would say consider a thermostat soon, That can cause it to run a little higher as well as higher with ac on. low coolant? You did not say exactly how much you added but,, it does not draw from overflow until and if needed so that is not a good indicator of loss of coolant, The overflow will go up and down level wise. I still lean to thermosat per your symptoms
if real hot in your area like here? ac on etc. in traffic, you are fine at half way or a little above. T stat is my thought