I think base taking is fine but it needs some refinement, fighter hangers should be indestructable so that no base can be taken without opposition. As it stands now with our EZ mode bombers the sop is take out the VH, FH, ords and take base after town is flat.
With my changes it would be deack field, maintain CAP, takeout VH, flatten town, take base, BUT the defender would have a chance to up fighters if he is determined.
IMHO this would add to more air to air fighting, without too much compromise.