It's bigger, let it go.
Yes, I agree. 350m-400m is bigger than 290m or 305m. It's just not some ridiculous figure like 750m.
What's ridiculous about it? At 750 meters, Kirks Enterprise is has EXACTLY the same dimensions as the Enterprise-C; the singular difference between them is actually the length of the nacelles beyond the engineering hull.
Is there something I don't know about the Enterprise-C that makes it "ridiculously" large?