Dude you're way over-thinking this!
You're notes - E A A C B E
Check this out:
C Ionian
e:---------------------------7-8-10-|
B:-----------------------8-10-------|
D:-----------------7-9-10-----------|
G:-----------7-9-10-----------------|
A:-----7-8-10-----------------------|
E:-8-10-----------------------------|
C Ionian
e:----------------------B-C-D-|
B:-------------------G-A------|
G:--------------D-E-F---------|
D:---------A-B-C--------------|
A:----E-F-G-------------------|
E:-C-D------------------------|
Note the similarities. That is the most basic explanation of what you are playing.
Now if you want to look at it as an AmADD9, you can do that to.
A Major:
A C# E - 1 3 5
A Minor:
A C E - 1 b3 5
AmADD9:
A C E B - 1 b3 5 9
Does that make sense? If so, you'll see that essentially you are toying around with A minor. With A minor, you now have C Ionian, D Dorian, E Phrygian, F Lydian, G Mixolydian, A Aeolian and B Locrian.
If you wanted to mix it up a bit, since you have a really open and full sounding chord, you can play A Melodic Minor to spice it up a bit.
Hope that helps.
Rock on!