I've read Akuma de Sorou, Doubt!!!, Kimi wa Girlfriend, Bokutachi wa Shitte Shimatta and am looking for some manga's that have a similar story vein...

Hmm. Isolation...

Kare First Love
Koko ni Iru Yo!
Nagatachou Strawberry

So far, at the top of my head; only those ones. ;P

the wallflower
Really, most shoujo.

Hmm...well, these are all just "isolation"

Imadoki!
Penguin Brothers

I would've suggested Akuma to love song, but it seems you have that on your reading list already : D

A lot from my lists match that
Here's most of them

Similar stories
Cynical Orange
Kimi ni Todoke
Chocolate Cosmos
Good Luck
The Hating Girl
Bitter Virgin EDIT: oops looks like you read that sorry
Kiss, Zekkou, Kiss Bokura no Baai
Othello (shoujo)

Others
They, Too, Love girl protagonist is a loner
H20 menga's a loner
Angel Shop the girl is quite cold
Joousama no Inu "
Shugo Chara! at the beginning she fits this
Watashitachi no Tamura-kun one of the girls fits it
Dear isolated
Tenshi ja Nai! sort of she tries not to attract attention
Oyayubihime Infinity "

Dokebi Bride is good if you are looking for a supernatural manga. The main character is a very isolated girl who can see spirits.

Heisenberg may have slept here.