Hi Zeke. Wot a place to live, spent many happy months there. But I digress..
I note you quote the Jeppesen manual on A320 Airport Analysis, Flex Take-off procedures and am quite bothered by item 6. You quote that V speeds are based on the Flex Temp (Corrected Temperature). Are you sure this is correct?
I have always taught that the V speeds are based on Actual Take-Off Weight and make an association of Temperature & Power / Weight & Speed.
I work from the Airbus FCOM's and these indicate speeds are always based on ATOW, be it A320 or A340.