I disagree on cannons damage meybe 32pd and bigger cannons should gain some damage buff, becouse Frigate reciving a broadside from SOL should be really devestating and frigate should run from enemy SOL not fight her.
I would actualy limit ship speeds so mods and wood choices would not produce overly fast ships that should not be this speeds are my idea so :
7th, 6th 15,5kn
5th rate 14,5kn
4th rate 13,5kn
3rd rate 12,5kn
1st and 2nd 11,5kn