Shields are 95% fine as is.
The only thing that bugs me somewhat, is that circular shields don't handle long thin ships at all well.
Take the Odyssey for example; it's shield is huge in order to accomdate the length of the ship, which magnifies it's frontal profile with an active shield to damage-magnet proportions. And there is a
lot of empty space inside the shield which just seems, I dunno, wasteful. An ellipse would be much nicer.
This may or may not be as intended, or in some way a hard limitation of Domain shield technology.

But then again long ships are pretty rare, which may be a factor of such a limitation as if you are limited to a sphere as a defensive barrier then you're going to want to take advantage of that as much as possible. Thus most ships are fairly, "squarish" in proportion.