Ship Design Advice for Crystal

[Enigma]

Ok I am in an advanced game and most tech has been discoverd. What is the optimal balance of Defense and Offense for a Dreadnaught for a Crystal Race? I find that I have placed 10 or 11 Armor (8 or 9 Crystal plus scattering and stealth) on my ships with 3 or 4 shields. But that leaves little room for weapons. On a 1 to 1 fight my ships win easily. But in fleet actions they have not done that well.

I have one design mounting 5 Heavy Anti-Proton Beam and a Energy Dampener III.

I have another design with an Energy Dampener III, 2 Heavy Shield Depleters V, and 5 Heavy Shard Cannon X

Both designs seem to do worse in fleet actions. I think it is because the weight of their firepower is light.

Any ideas?