Maybe we are doing it wrong- we usually take uke on a short trip before his fall. We drag him out a step past his balance on Ichi (linear) techniques and halfway around the block on Ni (turning). They get sick of going one direction just in time for the punch in the face and reversal.
Guess I don't have to explain ichi and ni to you, Miranda Sensei!
Do you atemi or something else to "break his intent" before you try to lead him off balance?
Because I think sometimes atemi puts uke back on balance.