do you know what typical unstick speeds were?
If I remember correctly from three brief flights on the BMk35 fifty years ago, at max T/O weight lift off speed was around 120-125 knots, Vmca was 175 Knots IAS, but it took almost 50 seconds to get the gear up and accelerate through Vmc on a summer day. The only alternative was to reduce power on the live engine!
The very slow retraction time of the pneumatic gear retraction system was the big culprit; IIRC it had no pneumatic accumulator, or if it had one it was very small!