Campaign Feedback:-
I don't still have the NAR campaign that I started using the new NAR economy setting. However here are a few details from a stock beta campaign using many of your parameters. ( governmentMod, Increased Dock costs, reduced Naval war budget (1.5) although not your increased upkeep values. ). I think the data is still relevant.
Spring 1890 start to 1907 , Legendary (using a complete set of 'historical' shared designs for all nations at start. More later)
Spain Navy:- 4BB (2 very old, all pre-dreads). 6CA, 12 CL, 19 DD, 17TB. (120000 Tons total), Current Naval Budget 890 million.
Tech level is very behind. My CL's are still from 1890 and I have to set fleet to limited or defend except in specific regions of expected conflict and be very careful. May be able to build an Espana type BB if I am very careful in the next few years. This is good, its pretty close to historical isn't it.
Austria Hungary has 11BB, 25 CA, 8CL, 5DD & 6 TB's (28000 Tons total). Current Naval Budget 4.9 Billion. Technology level is average.
UK has 14BB, 18CA, 21 CL's,39DD, 24 TB (690000 Tons total). Current Naval Budget 10 Billion. Technology level is Very advanced.
No Nations have collapsed or dissolved although Russia has had its revolution (as it always seems to a few years after whatever campaign start date.)
Shared Designs.
I know that you said that its too early because of probable major changes but I find it really difficult not to use them because the ai designs can be so hit or miss.
Here are 400ish shared designs of ships upto around 1915. These should generate completely shared design fleets for 1900 or 1910 starts.
(there is some randomization because of randomized start techs but you should get about 95% shared, its the DD's and TB's shared designs that are more hit & miss. I will do a complete 1890 (its nearly there now) start but they only just got that working in official beta so its not relevant yet anyhow.
These are all based on historical ships and are not necessarily good designs. Firstly I tried to make them look roughly correct, then I used data for guns, speed, armour thicknesses, range. There are a few hyptheticals too (denoted by (cc), eg if I did not create US or Spanish BC's for a 1910 start the ai would just create something instead so it was better to include a what if that is similar to something actual.
Anyhow hope these are interesting or useful for people.
https://ufile.io/qen2s887
Note about shared Designs in the campaign currently:-
The problem is that after a few years the ai upgrades these ships and so when you encounter them you often find that your lovely historical BB now has 3 4" inch guns in ln place of its forward 12" gun... no deck armour or belt and 18" on the stern Belt. Upgraded shared designs may actually be even worse than stock autogenerated ships as a result.
It would be really good if the ai did not upgrade shared designs really or had a different logic. I have been experimenting with the following settings in Params to try and limit the amount of replacement parts in ai refits (I don't know if there is anything that can be done to prevent armour redistribution ?):-
ai_refit_base,0.3,"Choose whether to create an updated design based on existing designs, or create a new one and build.",,,,,,,
ai_refit_simple,0.9,Сhoice between updating only technical characteristics of the ship and replacing parts.,,,,,,,
Long post, hope its either interesting or useful.