A 2/2 DD for 8 IPCs would dominate a 2/2 SS for 8IPCs, since the sub cannot defend against air. One will always prefer DDs compared to a SS, hence no opening fire for any SS!
I say a 2/3 DD (with shore bombardment ability) for 10 IPCs will do, were as the cost for a BB should be reduced to 20 IPCs. Lower the cost for a CA to 14 IPCs, not raising it to 18 IPCs. It should be cheaper to defend than attack. However still a SS and a FTR is slightly better in offence than a fully loaded CA for 14 IPCs. What makes the difference is air supremacy from carrier based FTRs over SSs, but only if CA is protected by one DD that disrupts the surprise attack from SS. So no more stacking of SS, except for defense! When it comes to attacking FTRs one has to consider the fact that a defending CA always (except for LRA) has the initiative against attacking FTRs! Hence the fact that an attacker with FTRs or SSs will win on a IPC-for-IPC basis against a defending CA that is fully loaded (strongest naval defense) is more theoretical than practical.
However the price for a FTR should not be raised, keep it 10 IPCs. More over one should include the air supremacy rule, or else the DDs will dominate the CAs (better in both defence and attack)! The air supremacy rule will make CAs important, in offence when attacking an enemy force without FTRs and in defense in order to deny an enemy naval force air supremacy!
Do the math and you will see how balanced it is (see below)! To find out the true fighting power, one need to consider the number of units that can absorb hits especially BBs 2-hit ability. BBs will be the best attack unit as long as used in combination with a DD (to disrupt submarines) and FTR (to cancel enemy air supremacy), just like it should be! No longer are subs the best offensive unit (as long as the enemy is protected by DDs)! Great!!! So why buy a SS? I say, SS are for protection from amphibious assaults and convoy raids (see rule clarification below)! Just like it should be!!!
Convoy Raids
The U.K, U.S. and Japanese palyers are susceptible to suply line interdiction. This rule imply that enemy submarines may conduct an economic attack against the supply lines (sea zones) adjacent to any of these nations industrial complex to “sink†IPCs. On the U.K, U.S. and Japanese palyers collect income phase, the player must subtract 2 IPCs to the bank for each enemy submarine within 1 sea zone of an industrial complex contolled by respective nation. For each enemy submarine within 2 sea zones of an industrial complex, the player must subtract 1 IPC. Any submarine that became submerged during the subjected players turn’s conduct combat phase, does not cause any economic loss. Multiple submarines may affect a single industrial complex, but the maximum combined loss can be no more than the territory’s (containting the industrial complex) income value. An individual submarine may only affect one industrial complex during each turn, but can affect multiple industrial complexes each round (i.e. one industrial complex per player).
10 CA + 20 FTR (14 IPCs/AC & 10 IPCs/FTR)
Cost: 340
Att: 110+320 = 70
Def: 310+420 = 110
Hits = 30
17 BB (20 IPCs/BB)
Cost: 340
Att: 174 = 68
Def: 174 = 68
Hits = 34
34 Ftr (10 IPCs/FTR)
Cost: 340
Att: 334 = 102
_Def: 434 = 136 (meaningless)_
Hits = 34
34 DD (10 IPCs/DD)
shore bombardment on a 2
Cost: 340
Att: 342 = 68
Def: 343 = 102
Hits = 34
42,5 SS (8 IPCs/SS)
Cost: 340
Att: 42,52 = 85
Def: 42,52 = 85
Hits = 42,5