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You are mostly correct on the whites with the exception that titanium dioxide started being used for some formulas starting in WWI. Lead and zinc oxides were however more common until WWII. I think cost may have have initially been the issue with titanium dioxide being used less. This holds true for USN and RN paints during WWI which is the era I found formulas for both navies.

Black depends what pigment was called out. The RN tended to use bone or ivory black during WWI and those are the brownish blacks. The USN used either Old Abe Black or lampblack (not carbon black). Old Abe was a bone or ivory black. Lampblack the USN had very specific requirements going back into the nineteen-aughts. It was and probably still is gas process made by collecting the soot of openly burning acetylene on an angled steel plate, it's about as neutral a black as you can get and until Vanta Black was the standard for the blackest black. During WWI lampblack was only specified by both navies for the grays and black, other colors requiring black pigment usually used the bone blacks. Here I think it was probably scale of production making the use of bone blacks more common. After WWI the USN mostly used lampblack although you sometimes find Mars Black the iron oxide based pigment called out.