Actually bases can be bombed quite safely from altitude of 3 kft, of course that requires quite lot of speed.
I did few offline tests, headed to medium base below radar, few minutes before target I popped up to 3 kft, leveled and bombed FH which did go down nicely. Immediately after drop 234 must be turned away from target and flak, either by diving horizontal turn or immelman.
Because of it's speed, Ar 234 can drop bombs far away from bases flak coverage, even in low altitudes. This makes long climb period unneccessary, provided that Ar 234 can get to target without noticing. Even if somebody scrambles from target for interception, Ar 234 will be safe.
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jochen Gefechtsverband Kowalewski
Units: I. and II./KG 51, II. and III./KG 76, NSGr 1, NSGr 2, NSGr 20.
Planes: Do 17Z, Ju 87D, Ju 88A, He 111H, Ar 234A, Me 410A, Me 262A, Fw 190A, Fw 190F, Fw 190G.
Sieg oder bolsevismus!