For the record
Today (5.1) we took an Aztec "E" through it's paces.
Temp was about 1-2 C or ISA-13/14
2 POB, full fuel
Left EFATO at 270' (approx 870' AMSL)
Blue-line climb was 600fpm indicated, gear up, flaps up.
Later we tried the full power to both, blue-line climb from take-off (approx 300' AMSL) and acheived 1700 fpm.
We were probably an hour lighter (fuel) and 3-4 degrees warmer (so ISA-11/12)