i am also VERY VERY carefully when starting a Blenheim on a DogfightMP map.
Using fine pitch i seldom use seldom more than 2300rpm - having always a quick look at the temp gauges. I am far away from using 110% throttle with fine pitch , therefor i dont activate the "boost cut, out".
I even try to roll in start position with enginetemps below 200°. To get a longer save time to run the engines at 'higher' rpms during the actual startrun.
And than after going to course pitch i am wondering why the possible rpm numbers are so high in the instruments

, so low they are.
sidenotes:
-i have no proplem with "one bomb is falling when opening the bombdoors". It does not happen with my settings.
-you dont have to activate magnetos manually (in any CoD plane!), they are activated automaticly as soon you hit "I".