Is there a typo in the original post? I did a double take when I read the following two lines:
0.87 is nearly 10% higher than the ideal; yet 0.86 is close to optimal? Is the reported Tochiazuma number is in error?
Isn't uwate-hineri where one twists an opponent down to the dohyo. Osakate sounds like a more sweeping move as the attacker is bending backwards and swings the opponent out of the dohyo.
Same troubles here. I can get to www.japan-guide.com but it doesn't look pretty. Still early my day, so will try again later once (if) the problem clears up.