I finally found a different HR intended to fix Subs vs planes:
@deslock:
IMO, subs are too weak if they can’t be used as defending fodder (I know some other user agree as I read posts complaining about this). To illustrate, suppose USA approaches Japan with an invasion force and Japan strikes first:
Japan (attacker):
8 ftr
2 bmb
USA (defender):
2 CV
4 ftr
8 sub
2 dd
4 trn
The rules are fairly clear that in this battle the USA can’t choose to take subs as losses, which means Japan has a ~90% chance of victory (killing everything except for the subs). I’m contemplating a house rule that states:
Defending subs can be hit by any air/sea units regardless of whether or not an attacking DD is present. However, if no enemy DD is present, the subs may submerge before any rolling. If subs attack and no defending DD is present, then defending air units can’t hit subs (even when they’re on the surface).
(I believe that the last two sentences are how it already works, but I included them with the house rule for clarity)
This way subs’ current capabilities are preserved, but they can now be used as defending fodder. Does that seem reasonable to the more experienced players here or does it throw off the game mechanics? (I’ve only played AA50 a couple times)
And there is also this thread about how to limit the DDs vs Subs ratio (same problem):
http://harrisgamedesign.com/phpBB3/viewtopic.php?f=40&t=6367