Dodging Sea Storm with CS

How many times did you lose CS for Sea Storm?
It can be very frustating lose your CS, because all your attacks will be for nothing, only info for the enemy. But there's a way, you can explore the mechanics of this game. Let's read the description  of the spell:

Description - Poseidon rises and beats the ships with furious waves. It is not a good day for seafarers. Destroys 10-30% of the enemy's naval units (can only be used on an incoming attack).

This spell don't affect transport boats neither land units , and it is based on the population count not the number of naval units.

All you have to do is to send a certain amount of naval units(not including TS or FTS), the amount should be before the 10% or after the 30% gap.

Examples:

1LS + 1CS = 10 + 170 = 180pop
Sea Storm casted. It will destroy nothing. But,
1CS= 170/180 = 94%
1LS = 10/180 = 6%
I attacked myself and the spell brokes the rule. It ended destroying 1LS...

2LS + 1CS = 10 + 170 = 190pop
Sea Storm casted. It will probablly destroy 2LS.
1CS= 170/190 = 89,47%
1LS = 20/190 = 10,53%
 Let's move on.

39LS + 1CS = 390 + 170 = 560pop
Sea Storm casted.
1CS= 170/560 = 30,36%
1LS = 390/560 =  69,64%
That's the maximum you can get from above.

154LS + 1CS = 1540 + 170 = 1710pop
Sea Storm casted.
1CS = 170/1710 = 9,94%
154LS = 1540/1710 = 90,06%
That's the minimum you can get from below.

Well, you'll never send a CS with so few LS(people can split birs and easily destroy it), neither with so many LS(players can snipe with DLU), neither with the risk of the Sea Storm. Then, the best amount of LS you should send is 39.