Well here's your traces (corrected values and raw) :
Dozy, The spiky traces are merely an indication of how confused the computers were.
I can promise you that those AOA vanes were essentially pegged to the high AOA position after the stall, moving down slightly perhaps only when the crew tried some nose down stick.
If the traces show the vanes moving that much and that regularly, it has to be bogus.
Probably a good argument for routing the signal to an AOA indicator first, and then to the computers/ADRs as a derived signal. The computers/ADRs, it appears, cannot be trusted with the data in extreme conditions.