my way of doing bomb runs is to drop lets say 80% of my bombs on the city, then the final 20% on whatever factory i deem a good target.
the issue is team work though.
sure the 303rd can get the city below 50% and also the AAA factory in one go, but, the rest of the "country" dont really notice the effect so dont join in, cos they think its "just milkrunning useless toolsheds".
for instance if knits are getting hit hard, by lets say bish, we'd bomb cities then troops and/or Ord factories. But, you also need local jabo runs on the bases AFTER the factories are dead. But no one realises the opportunity to stall the front. Fights can still be had, but they wont have any troops to take bases...