Well first of all congratulations on a job well done.
When I saw the battlecrab fire that ANIMATING beam I couldn't believe my eyes. Oh and the glowpoints really add to atmosphere in the game.
About the Shadow/Vorlon ships:
The thing is while they are powerful they only have few weapons at their disposal and when they are disabled the ships are doomed. This is especially the case with battlecrabs. I think the best solution is to simply increase the hull to turret hitpoint ratio, I myself increased it to 60 for the battlecrab. This way the ship itself still has the same strength (and won't cause additional balancing problems) but it is next to impossible to disarm it. The shadow beams could also use some additional power.I want to see them slicing that G'quan with a single shot
Other thing is the size of the Vorlon cruiser and large battlecrab. While the Vorlon cruiser should be "over 750m long" it is actually 256m in length also large battlecrab is 2km wide instead of 3km.
Well that's it, not exactly huge problems but you don't see me
not complaining.