Don't forget 9 Sqdn. They participated in many of 617's precision bombing missions, and likewise suffered appauling losses.
Tallboy related crashes see: Lost Bombers - World War II Lost Bombers
- due to fuel starvation, bombed from above, slow & reduced maneouverability due to excessive load, reduced armament... and thus easy targets for fighters and flak attack, etc. etc.

And yes, once Tallboys & Grandslams etc were released, the planes would leap upwards, often resulting in mid-air collisions since the groups flew in extremely tight formations.

Note re fuel load, stripping down weight:
"The six-man crew on this operation, (Tirpitz) is explained by the fact that, since the aircraft was operating at extreme range with additional fuel tanks. The load comprised one 12,000lb Tallboy and a fuel load of 2,406 gallons - the normal Lancaster tankage being 2,154 gallons. The mid-upper turret was removed and fared over to lighten the aircraft."

Signed by Fred Wilson:
Named after Fred Sutherland, of the Dam Busters.
- still alive, well and, with his wife, hiking Alberta's Rocky Mountains. Pic near the bottom of the page at NLS - A Dambuster's Daughter
- his escape after crashing, after successfully breaching the Dortmund-Ems Kanal at: Lost Bombers - World War II Lost Bombers