First, the korean or karate uniform is not for grappling?? then why do they wear it in Judo?
Second, the concaved chest you mentioned is the teaching of "like turtle's back and Crane's spine" (龜背鶴身) from Fāng Qīniáng's white crane text, it is talking about the hunching back posture, but you will find the degree of the hunching vary with different white cranes practitioner depending on how it is interpreted.
Third, not being able to express any type of power and lack of power while it is yin?? how about yin and yang coordination?? how about being fluid and loose in the process of moving(yin) but hardening at the moment of contact(yang).
if you want, you can have a look at 3:47~5:02 of the video
http://www.youtube.com/watch?feature...&v=ldtDWC2RQW8
Last, we are not korean. below is the interview on our style in National Geographic.
Part(1):
http://www.youtube.com/watch?v=yFDsK...eature=related
(6:07~the end)
Part(2):
http://www.youtube.com/watch?v=tI279...feature=relmfu
(begin~4:40)
Photos of Master Tong and students visiting Songshan Mountain (嵩山) Shaolin Temple in Henan (河南) in 1992:
http://www.facebook.com/media/set/?s...5577069&type=3