Dartman, I am afraid but the information posted by you isn't fully correct. Those are the items you have to apply the corrections to:
On approach, at least the following published altitudes must be increased in low OAT
conditions:
• MSA,
• FAF altitude,
• Step-down altitude(s) and MDA(H) during a non-precision approach,
• OM altitude during an ILS approach,
• Way point crossing altitudes during a GPS approach flown with vertical navigation.
As it is not allowed to modify the altitude constraints of a non-precision approach, a
minimum OAT to fly the approach with the «FINAL APPR» FMGC mode must be
established.
For OAT lower than this minimum, selected vertical navigation must be used.
Remark:
The determination of the lowest useable flight levels by Air Traffic Control units within controlled airspace does not relieve the pilot-in-command from the responsibility of ensuring that adequate terrain clearance will exist, except when an IFR flight is being vectored by radar.
As you can see, you don't correct the DA for the precision approach. 
Albatross, Canada isn't only the place to chill the beer. Just yesterday we flown northern China route and the OAT in ZWWW Urumquie (hopefully correct spelled) was -28 C, using that airdrome as an escape airdrome in case of decompression with MSA somewhere around up to 10000 ft, one better make sure to apply corrections.
Cheers.