There are lots of things to consider when painting a WW II to modern USN warship.
FS 26270 is a camouflage paint. It is selected because it's reflection of light can vary so much depending on lighting conditions. It looks lighter on sunny days and darker on overcast days. Some of this is by design. Anyone who has spent as many days as I used to do dealing with photos of USN ships and trying to match color balance of the grays of a CVN in the Pacific with one in the Atlantic can attest to this. The hull will reflect the different colors of the sea and pick up that tint. The semi-gloss finish attributes to this as well.
When working with photographs that are intended for printing in a publication, color matching comes into play. It is always a good idea if dealing with more than one photo appearing on a page of objects with a known color factor, to match the colors up. Good ol' FS 26270 can do some amazing things to the colors that reflect from the hull. A USN ship photo can have a distinct magenta cast in the shadows, or a cyan one. So it can be hard when looking at photos to determine the correct reflectance and color cast.
This can be much worse trying to judge WW II camo brightness in black and white. Of course the paint faded, etc., but in those days and the films they used required colored filters for the lenses to try to knock the UV haze that is always around ships at sea. These filters and sometimes the films themselves rendered the contrast of the gray tones much different than they actually were. So, a photo of a WW II ship in 5-H Haze Gray and a photo of a ship in 5-O Ocean Gray might match up pretty close in two photos. However those same two ships when viewed by the human eye pier side would have a very different reflectance. The Ocean Gray ship would be the darker of the two.
I believe it is a good idea to stick with the known camo colors when painting a model. Of course adding some white for "scale effect" can be a good idea.
Trying to judge the proper reflectance and color balance for a model from color photos on the web viewed on a non-color calibrated monitor by a mark one eyeball could be frustrating experience.
If anyone is interested in looking into this in more depth, let me know. I'd be happy to try an answer any questions they might have.
It can drive you nuts, try to keep it fun.