I got an ippon today at class shiai with this version of Tomoe Nage. However, I don't think I am conscious of all of the details. I just do the move and it works. I'd like some additions and/or tip for doing this move.
You have double sleeve grips. Uke is pushing into you and slightly bent over.
Tug down on both sleeves. Uke reacts by stiffening upright and freezing.
Step in to the side of the triangle slightly with your left foot.
Bring your right foot to his stomach with your toes pointed towards his head if possible.
Fall down to your back right under his feet. Don't fall back too far away. You have to be under him. This is the most important part.
As you roll back, pull with his sleeves and push with your foot so he goes up and over.
Most likely, Uke will try to regain his balance and fall to the side or on top of you. Use your sleeve grips as a steering wheel. If he posts with one hand, pull that sleeve and push with the other to destroy his post and tumble him over that way.
Finish with mount.
In wrestling, I like to do this move from an overhook (on the opposite side as the leg I extend to his stomach) and a collar or inside-elbow grip. I forget what the name of the takedown in folkstyle is called, though.