Hi Steven, welcome to the forum! Yes, it's time to stop aerating, if I remember correctly your liner prefers 80 - 120 so 90 is a safe place and your pH @ 7.4 is also in the mid range (I always like to have a little room for change it makes it easier to catch a potential problem before it becomes a real problem)
Congrats on the great results using Ben's methods, pool stores would have had you carting lots of acid and pH plus to your house and probably wouldn't have given you the excellent water you now have.