while SOME ap is underpowered ( 8 inch 55 Cal USN and 12 inch Trips)

there are others like the brit 8 inch trips that just do ridiculous amounts of damage over their us counterparts even on targets even at the "bad" angles for the use of AP

so u'd have to be careful which ones you beefed....

I dont sem to find them very effective compared to HE rounds I have tried both and like the HE better. In my opinion make the AP shells stronger than HE