The New Bedford Whaling Museum and the Mystic Seaport Museum both have strong resource libraries. There are also a number of newspaper archives.
CW Morgan was stationed in San Francisco, but always registered to New Bedford. There was a small fleet of these whalers and they all seem to have retained their East Coast registry. Morgan and several others were under the Wings, who were in the business for decades.
Electric Blue was a dark blue grey. A contemporary utility paint color called "Slate" matches electric blue. It makes sense slate could have been used for the waterways and coamings of a ship, or the entire innerworks for basic protective service.
Ochre paint has been found for the inner works of Morgan's late career, and ochre is also seen on whalers in general much earlier, as early as the 1850s. White, like the Lagoda model, was also used at the time. The most common color in the 1840s-50s was green! Several early paintings of whalers show dark green cabins.
Morgan was built at a time when whaling ships most often had decorative transoms and broad white bands on the hull marked of with fictional gun ports. Other whaling ships in the 1840s-60s were painted overall black, black with fine white bands picked out in the rails, black with a grey band near the top rail, black with a white band but no gunports, and more than a few were even painted white.
I'm not sure what Morgan may have looked like with the Howland Company in the late 1840s-50s, but one Howland whaler in 1857 was black with gunport bands and dark green innerworks. If the Howland Company had a "fleet look" it could have influenced the Morgan, but as the Howland ships were from all sorts of sources, perhaps not.
A ca. 1870 model of another Howland or Wing ship shows white innerworks with a white gunport band on the experior.
During the Wing years (1864 - 1922) Morgan was changed and updated. The plain transom and black hull with white rail stripes would have looked a lot more modern than the old gunport bands, especially by 1900. The Wings were probably able to develop a strong fleet appearance, and that the late Morgan look was probably typical of the Wanderer and many other Wing vessels.
Sorry, long answer but its a neat subject.