Unless I am completely out to lunch, isn't it simpler to realize what you are doing instead of worrying greatly about fine tuning the timing. Timing correction will come later.
What worked for me was to kick with (say) the left foot realizing the goal was to induce right hip drive which was intended to aid in driving the right hand spear. Fine tuning came after getting the potentially difficult diagonal action happening.
Please correct me if this isn't correct ... I'd appreciate the correction.
If you're not swimming; then you should be skiing......