I went through all the things that you have with your Avalon.I thought,yes the action does not look high and it seems easy to play,but not as good as it could be.
Take it to a pro.luthier or guitar technician and have it done expertly.You won't regret it.
I have an Avalon L-360 and a Lowden 0-10.We have a graet luthier here who has done a fantastic job on both guitars.I did however have to take the guitars back to him twice.The point is,you have to be happy with the guitar.Do not compromise.Avalons are good guitars and you can get the actions low on them.It may need a bit of work to get the action how you like it,but it is worth it.
I gig two or three times a week in an acoustic guitar duo.We play long sets,so the actions have to be low and the guitars easy to play.
I do believe that the guitars need to be set up better at the Avalon factory.Lower actions will bring out any problems with the neck and frets which should be addressed at the factory.
Keep playing your Avalon and get it set up how you wan't it,then you will not have any doubts about the guitar.Then you can really make some great music.
I hope this all helps you.Bye for now.