I always have trouble with tenchinage as well. Not the form, since it's simple enough, but because it is so simple, it's a devil to get just right. The worst is tsuki tenchinage, it's like trying to throw air.
Another is receiving yokomenuchi. Somehow my maai is never right, and I seem to get conflicting advice on it. Probably the conflict is just in my mind...
I had to techs against jo on my last test, and kept ending up way too far from uke, groping in the air for an arm or jo that wasn't there. Pathetic....
kvaak
Pauliina