Hi Mariner,
There are many keys and one just needs to find the right one that works for them.
I try and feel an exaggerated loop coming on the inside for the first movement to start the downswing. It feels almighty but shown on video - I stay on plane. It's just a matter of engraining this feel and trusting it.
I don't have over the top if I maintain my hip and spine positions throughout the swing. It's only when I try and rip the lil white pill that I come OTT.
In practice I work on my swing.
When it comes to competition. I am only focusing on the target and for my woods, I'm thinking of hips in position and for the full shot
irons, I'm thinking of the length of the swing - half.
Good luck.