After the flushes I filled with coolant. I never ran it without fluid. I don't hear waterfalls and the temp gauge goes to normal operating temp without hot air and then I shut it off.

 

Are you reading real time temps (ie Ultragauge or some other device) or using the dash needle?

If your running temps are similar to before, then there is no reason not to run it for a while, take it for a few miles. Turn things on and off. Try and burp the air out. Getting a few hot/cold cycles done is only going to help.

If that doesn't work, you know you might have to look into it further.

My guess is after taking it for 5-10 miles, you'll come back and be able to get some more coolant in the bottle.

If you are relying on the dash gauge then proceed a bit carefully, as it only starts to move upwards after damage temperature has been reached. And get a proper live temp reader.