Sorry of this is repeating anything I missed.
Mizong was Huo Yuanjia's style sure.
I live in Shanghai and have had access to the photos and records in the Jingwu society here, also to teacher Bao Wenguang of Eagle Claw who's teacher, Bao Yixiong, was a Chen Zizheng student.
According to this info, the 10 basic forms were derived from either Northern Eagle Claw or Er Lang Men.
Zhao Lian He is listed as teaching 10 basic forms and for his own style "Er Lang Men".
As for forms with the name Tan Tui, loads of styles have them. I have recently made a video that includes part of the Chaquan Tantui being taught in Shanghai here:
http://www.kungfuology.com/kungfuolo...park-kung.html
It's Zhongshan Park Pt Two , right near the beginning.