Salutations Aztec
I have flown various models and standards of Airbus, and concur with your 6 parts acceleartion, 4 parts delta altitude, energy model.
However, on further referencing, I discovered some old notes that snuck past me some time ago-
Airbus Industrie Briefing Notes Sept 1998 " energy sharing is applied for acceleration ( 70% ) and for altitude ( 30% ) fom ACC ALT up to first climb speed".
Sits comfortably with me reference the 0.1G autopilot pitch authority.
So many models, so much Franglais, hard to maintain currency as an Airbus Nerd!
Perhaps the energy difference to do with different engine models?