I'll look at the Mankin analysis you spoke of as soon as I'm not swamped. I can find it but a link would be handy.
My issue is with the lower half. I'm close with my dd, but I'm not there yet. She's getting the rear hip around and forward, but she doesn't have enough momentum/push/drive or whatever it's called. .
Ted Williams, Barry Bonds, Teixeira, and many other elite MLB hitters, do not "tilt and then swing", or "tilt over the plate" to set swing plane or however you wish to descibe it.
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Hands create shoulder tilt, that happens automatically! Fine motor skills start with hands, watch babies develop.