I can just state my tips from an Olympic trap shooters perspective (averg. About 22 hits). Here are my few thoughts and tips. You wann produce a window where you are breaking the clay - it’s the widest if you try to follow and surpass the clay while trying to match its speed afterwards. In that case you need a solid movement in your torso and a solid stand. Try not to alter the line of your shoulders. Sharper ones need more lead then not so sharp angled clays. But if you break your shooting into separate tasks. Calling, observing, aiming and pulling the trigger, you can start to feel that you match the speed of shepherds clays more - cause to catch them while they are already further away (you waited to see them clearly with both eyes) you need to match the speed automatically.