What's up guys... And hi Dana..
Thought I'd jump on this one..
I call this being top heavy and this is where I find that state of mind in terms of what your sub-conscious 'thinks' the body needs to do to make power.. I have found that more so the western thinkers tend to raise up their <Yi> or Intent and they end up leaning into the strike when they want to make more power which creates a completely different power dynamic.
The problems with this are many and contradict the concept of power generation in these kinds of systems which advocate making power from the horse... Sinking in the mind has to come before it's natural, we have to convince our sub-conscious that using our horse is the way to go for generating ground power and maintaining good stability for both receiving energy as well as issuing energy, which can be in the form of bridging or striking..
This is where the Easterners seem to have an advantage in sinking their 'Chi' which to me is not mystical just part of that metal component that can let us, or not let us do that cool technique the way it was intended... I find that when folks associate excitement or anxiety there Yi <intent> 'Chi' or 'mind state' tends to rise up, raise our center of gravity and reach/lean with it...
Sinking seems more associated from my experienced with being relaxed or loose, again, I think this mindset is the one to shoot for when looking to 'sink the chi'. Just one more reference to make Bill wince..
Not sure why but this is a common problem, from what I have seen more in western thinking folks.. Folks also need to trust their horse and train it until their inner mind trusts it too. And BTW this is another very good reason to train push hands or Chi Sao because good play demands a good ground connection.
Just my thoughts and my experience. I still have this problem and was a standard part of how I fought in the old point matches..