The heavy and light cruiser should still be made a bit smaller (check the photo; even the heavy CA is only 2/3 length of the BB... Battleships were truly massive!)
The all grey freighter/transport should grow to whatever size you decide for the light cruiser (can lighten the jpeg skin in eg. Photoshop)
Seeing them all together, it might be possible to grow the minesweeper to about 2/3 size of the destroyer (to enjoy more details from the 3d model)
And remember to scale the LVT to match Slith's default size for a DUKW (so it will match the land units once it's on a beach)
This fleet is going to be AMAZING!!