Most realistic fleet size setting?

I’ve asked this question before and since then I’ve encountered varying info since then and tested it myself but I wanted to get more community opinions.

I’ve heard that 1 unit of fleet size means 10% of historical so fleet size 10 is historically accurate. I’ve also heard that 12-14 is required to replicate Jutland. From my personal testing on fleet size 12 with 1890 start does not produce historical hull counts but I like to build bigger ships than real life.

Additionally, does using the 1900 start with historical resources on make much of a difference?

On a slightly unrelated note does anyone also know how to make designs closer in size to historical ones? I find that my battleship designs often have to be many thousands of tons heavier than historical designs they are similar to.