[golfbulldog]

Jeff, I agree with Mike, "heavy hit" is a phrase not in the book and is laced with the blood of previous arguments... but the correct impact feel is as Homer described...slow and heavy and dragging moppish...if that feels like "heavy hit" ...then that is your feel... Homer said "'heavy' feel" (2-E)

But I think that you want some facts about the "quantity of impact"... Homer suggested that the physics of impact could be maximised if the clubhead did not slow down much through impact interval

IMO, the real questions you seek answers for are:

How does Homer explain the benefits of resisting impact deceleration?
The bit of the book you are interested is in 2-E . I do not know if the science is correct but the idea that if you can minimise the deceleration of the clubhead during impact "zero deceleration is what would give maximum ball speed..."

Can a golfer resist impact deceleration? Homer suggested prestressed clubshaft... yet most high speed swing visions show the shaft releasing before impact...

as I am sure you have read - "Search for the Perfect Swing" said the clubhead acted like a free orbiting object...so anything you feel in the shaft at impact is not actually resisting impact deceleration...it is as though there is no shaft...maybe...

That is where a real and unbiased physics person is required....