Concentrating the fire from two or more fighters against the same target should alleviate the problem of lack of shotdowns in a duel between vehicles with high defense and low attack. Although I am beginning to wonder about a houserule that gives some bonus to fighters who concentrate their fire against the same target, representing the difficulty to avoid simultaneous fire from more than one enemies. Something like two or more fighters attacking simultaneously the same target (so they should have the same Pilot Skill - unless I make a second houserule allowing high Skill pilots having the option to "delay" his shooting to a lower initiative) having the option to combine their attack dice in a single attack roll.