Here are my thoughts...
Scouts:
Seeker stay at 15 (7.5 per FPS)
Arcova 20 -> 15 (7.5 per FPS)
Navigator stay at 20 ( 6.67 per FPS)
Light Frigates:
Disciple 20 -> 25 (6.25 per FPS)
Cobalt stay at 30 (6 per FPS)
Skirmisher 30 -> 40 (5.71 per FPS)
Long Range Frigates:
Illuminator stay at 45 (7.5 per FPS)
LRM stay at 30 (7.5 per FPS)
Kanrak 20 -> 45 (7.5 per FPS)
Siege Frigates are I think fine...
Anti-fighter:
Defense 60 -> 50 (12.5 per FPS)
Garda stay at 50 (12.5 per FPS)
Sentinel stay at 60 (12 per FPS)
Carriers:
Aeria 100 -> 110 (5.5 per FPS)
Percheron stay at 80 (5.71 per FPS)
Lasurak stay at 80 (5.71 per FPS)
Support:
Domina 20 -> 30 (7.5 per FPS)
Hoshiko stay at 30 (7.5 per FPS)
Subverter 20 -> 35 (7 per FPS)
Iconus 20 -> 60 (8.57 per FPS)
Cielo stay at 50 (8.33 per FPS)
Overseer 20 -> 60 (8.57 per FPS)
Heavy Cruiser:
Destra stay at 100 (10 per FPS)
Kodiak stay at 100 (10 per FPS)
Enforcer 100 -> 120 (10 per FPS)
Colony vessels are probably fine...
It may be worth taking at look at the various pirate ships, they are rather low in experience if I remember correctly...also, I always felt that starbases were a little low, but maybe that's just me...