Dang Char got an upgrade lol. But for some reason the art doesn't feel the same as the other angel strokes. Is it a different artist from the circle?

Base +22, savaris +2, Pinkie +6

Yes sekirei07. Most people know AXZ for Kutani's work, who I believe does most of the Angel's Stroke doujins. Hopefully he'll also do one for Infinite Stratos.

Base +8, Pinkie +6

Kutani hasn't even done half of the Angel's Stroke doujins, but that's definitely the circle's "show-off" artist, and probably the one most well-known in the western scene. AXZ actually lives up to being a doujinshi circle, consisting of a ton of artists. Like stated in the tags, this particular artist is Ryuuta. Here's a list of other artists associated with AXZ:
http://doujinshi.mugimugi.org/browse/circle/230/AXZ/

Base +8

http://www.doujinshi.org/book/387668/Angels-stroke-50---Infinite-Cha**les-kun!/
Alternative RAW: https://e-hentai.org/g/354313/94c1aa6c68/
English Translation: https://e-hentai.org/g/354449/e1c5553fab/
Spanish Translation: https://e-hentai.org/g/474684/8b1fa4baae/
Portuguese Translation: https://e-hentai.org/g/530703/3d523f75c9/
Russian Translation: https://e-hentai.org/g/757660/f27cd5305d/
Chinese Translation: https://e-hentai.org/g/363608/af3208ab8e/

Base +25