While I agree with Flare and D, I don't think the pylons are too skinny. Who says that the pylons need to be large? The only reason would be to support weight, and we all know . . .
So why is it necessary for any ship to have a hefty support column for something that creates a field that envelopes the ship? Keep them as they are, I say.
But the nacelles could use some shrinking, just because. ;)