Opinions on the 50% cost refit limit? Should I limit it to 30-40% to navalize SE IV?

[MKSheppard]

Right now, with my mod making you have to
plonk down 16,000 minerals to get the base
Dreadnought hull, the major naval powers
only have 60-70 ships, while medium powers
have 20-30, and tiny powers have 1-10.

My 62 ship navy, consisting of roughly:

10 Battlecruisers (1 foreign hull in there)

9 light cruisers

17 Destroyers

5 Repair Ships

5 Refuelling ships

2 light carriers,

3 Heavy Amphibious Assault ships (the only Battleship hulls I have in my navy)

2 small amphibious asasault ships

1 transport

2 Minelayers

Costs me 120,000 minerals per turn to
maintain

I need to correct AI problems here
tho...right now the AI only puts 5 engines
onto it's designs, and I've implemented
the ENGINES PER MOVE field, which makes
Dreadnoughts move at 2 per turn....you can
make your ships move as fast as YOU want...
depending on how much YOU want to give over
to engines, and not guns, armor, etc.