1) Yor are extremely frightening in battle. Their luck bonus combines
with their miniturization bonus to give them quite an edge. If you want
to be invulnerable to their 70 attack ship/fleet, you'll need to field
in at least 140 defense.
Huh? Even with a 50% luck bonus, a 70 attack ship should only deal an average of 35*1.5 = 52.5 damage per round. So 1 on 1, 70 defences on a single ship should be pretty decent defence, not typically overwhelmed. Of course, you have to multiply that by how many you are facing in a given fleet.
1) Yor had 25% luck bonus. Their ships did almost by the
rule significant damage to my ships, even when I've been fighting with
130 defence against their 70 attack. I constantly had to heal my ships
for quite some turns to make them again combat-ready. It was almost a
relief when I turned to Drengin, depite they had much stronger ships.
So in a 1 vs 1 fight, you were finding that a single 130 defence ship was taking a significant amount of damage each round from a single ship with 70 attack? I mean, if a big chunk of that 70 damage was due to weapons bonus *and* your ship had next to no weapons, so it took a lot of rounds to kill them, I guess I can see it. Luck bonus on it's own, however, doesn't come near to explaining that.
Also, if you are experiencing forced combat-ending shots against opponents with no defences, you really need to squeeze some more weapons in there. Past the point where your defence on a single ship exceeds their expected weapon damage you are getting diminishing returns from defence. If I was facing single 70/0 ships, I'd take 30/70 over 5/130 any day.