G'day HK guy,
"LOW RIGHT TO UP LEFT ("hit my heart" action), UP LEFT TO LOW RIGHT will hit the Upper leg more" might be a place to start, cross axial finger/hand/wrist/arm/body/feet movements are restrictive and prevent full potential movement. The AOT of the input to the kites bridle by lifting hands higher is minor, the greater advantage/control is found in your 'potential' extention and the speed you can achieve it....
Bottom line, hands by your side inputs forward and back will give you the best possible control, the rest is timing and appropriate power.
I'm no guru on this but if you watch my VF32 entry at around 45 secs I hit a few cascades, note the inputs are very slight, and really just a flick, but the ability to have room behind me for extended input allows more range for quick adjustments.https://www.youtube.com/watch?v=9iDVny7ovaY
Best of luck