Sabre is a shot gun type ship.
So 2-3 refire guns work on it mostly,
Altough i figured it out too by checking 4 and 3 refire guns, they were useless but improved my skills a bit.
Then i tested 2 refire guns which worked a lot, altough there are different type of guns, even for 2 refires.
I am good with Claymores, BloodStones, DarkBlossoms but not good with rail gun code weapons like IRON HAMMERs etc.
But Eagle is more agile than Sabre.