- Escorts in correct escorting positions, numbers and tactics (get rid of the routine wandering off into never neverland, leaving the entire convoy flank exposed "tactic").
- Convoys correct sizes
- Aircraft use correct attack profiles and weapons
- Better damage model; damaged batteries leak chlorine gas, less predictability (always the forward deck, flak guns damaged first, i.e.), fuel/oil leaks which increase the chance of detection, etc., etc.
- better silent running mode vs the invincible state it currently is.
- depth charge noise masking
- convoy noise masking
- enemy a/c that spot you relay that info. to nearby escorts/convoys.
- moonlight affects. (thanks rik007!)
- more wolfpack attacks. Even with H.sie's mod, there are not nearly enough with virtually none in some historically active areas. Pack attacks were the norm, not the exception, and there are way to many single attacks still.
Probably come up with others later
Btw, all the above were in AOD.