I'm with you Geoff
The number in brackets is the QFE conversion of the DA, NOT the RADALT value. We bug the RADALT to that value but the cues for the DH are taken from the BAR-ALT - The RADALT is secondary for terrain warning.
Similarly - I'm with you on "Decision Altitude". It's the Altitude at which you decide and you can drop below it after you've made a decision to go around.
OH