Since maps reset at unpredictable times, what you describe is just bad luck, I think.
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One solution is to go to the Combat Arena.
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Or, if you like bombers...
...and it's the middle of the cyber-night when you log on, put a formation of B-17s on auto pilot, go eat, take a shower, whatever, and come back 30 minutes later.
Just make sure of 3 things:
1. You are climbing out into an area that is not likely to have enemy interceptors enter it while you're away. This isn't that hard to do, even on the small maps.
2. There are no mountains ahead!
3. Your manifold pressure (throttle) should be set at 92%-95% power, otherwise when your formation goes through the wind layer your drones will slowly drift away and explode.
[But don't be an alt dweeb and go above 29k. That was the max alt for almost all B-17 missions, except for some 30k missions to avoid Zeroes in the Aleutian Islands. Anyway, I digress...]
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MRPLUTO VMF-323 ~Death Rattlers~ MAG-33