You can also try lifting the elbow of the arm uke gives you, during the tenkan movement, by making the first part of ushirotori undo movement of your arms. Draw in a deep breath. (I'm currently working on breath/kokyu power) This movement will lift uke's center and force uke's chest out and head back. If you do this fully, your arm will end up underneath uke's arm, and with aiki, this force will end up partly supporting uke. If you release uke in this situation, uke will fall, straight down, without need to apply any additional power to the throw.
I like to bring the hand to my forehead, and use the thumb webbing of my other hand to make uke's elbow pivot upward and out like a wheel - as a short person this is a good way for me to float uke upward.
I like the downward release as opposed to the outward release, and keep uke's arm tight against her body then like a small wave breaking over her shoulder curl the hand over and down in front of my center. Like a bokken cut as gentle or as powerful as called for in the moment.