Hm. On the one hand, the new Wren is going to be clumsy as anything to fly - it's got the Hammerhead's problem of overly-spread-out ballistic mounts, only worse. On the other hand, it's still got some very serious forward firepower for a destroyer, so maybe being a bit clumsy to fly is just part of how it's balanced. Alternatively, you could do something weird with it - make, say, the left two hardpoints as medium ballistic, and the right two as 1x composite 1x missile? That'd look all sorts of awkward with the asymmetry, but would likely be a lot easier to fly and use effectively.
I'm also not convinced that "Not good enough flux stats to support 4 ballistics" is a good balancing point - most ballistics are pretty cheap, flux-wise, and for a ship like this I'd likely leave small energy slots empty rather than go light on its main guns. On the other hand, "Not good enough flux stats to support 4x HVD" is absolutely a good point to aim for.
As for sprite, I'd be inclined to vote for the extended engine module of the #1 variation, with the shortened wings of the #3 variation. And I'd leave the purple out of the base sprite; use a plain off-white sphere (like the bridge but sans windows) and have a purple glow layer as part of the ship system's activation, maybe?