The turn rates for light battleships are way to fast. 13.00 is the turn rate of the geb, and we can already see how that contributes to it being so stupidly OP. Put a 13.00 turn rate on a murmillo or an osiris and balance is totally rip. Turn rates shouldn't be all -that- different they should be very close. but you had the right Idea of giving lighter BSs faster turn rates.
The same goes for dessies, giving a typhoon a 26.00 turn rate would make me piss myself in laughter.