Seems to depend on the player.
In your case, I can tell you have spent time on your form, but because the mechanics are built around the flat swing plant it's leaving a lot on the table.
If I were asked to bet, my best guess is that you might want to approach it more about changing how you balance and get from foot to foot in postures that get you more power for lower effort. That might not constitute a full "rebuild" as much as just get parts where the need to be to get more bang for your buck.
For starters, I'd be curious to see what happens just if you try to get your leading shoulder lower than your rear shoulder in the reachback like the door frame drill in the 3rd video above. Usually people are surprised at how much more power is available there from that change alone. The other videos will help your movement overall if practiced over a long period of time.
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