Haven't really looked at the stats of the units but I think the fact that the medium tanks all need tungsten and no chromium at all is gonna be a huge debuff to any nation with a lot of chromium in the late game and also narrows down the amount of strategically important countries in my opinion

the modern ships are too slow. making earlier vessels with canons much better.

May i Suggest a revision of the Naval Engines, their bonus are way too Strong, and coupled with the ''Raiding Fleet Designer'' Bonus of +10% speed some ships are becoming way to Fast to be near some degree of realism , i mean like Carries and Battleships moving at speeds of 40 knots, subs moving over 35 and cruisers over 45, it's really too op since most of our modern Warships right now go little over 30 knots, not to mention the Nuclear Reactor tech that increase these speeds even further.