When to use AP .vs HE?

[Kayback]

I've searched the forum, and I can't find anything worthwhile on this topic.

When do you use HE's and when do you use AP rounds for your deck gun.

The last SH game I played was SH1, and I absolutely loved it. Even on the higher settings I could often sink many more ships by stalking lone merchants or troop carriers and hitting them with the cannon than by attacking fleets with my torpedo's.

The only memorable torpedo fleet attack I ever made in SH1 was a head on shot against the Yamato battleship, wich resulted in me sinking it and playing dodgem with it's support craft for the next 3 hours. Wicked mission.

I was deadly with the deck gun.

However in SH4 I seems to be driving around and around pumping shot after shot into the smallest little cargo vessle and not significantly damaging it.

I'm assuming it's AP for war vessels and HE for lighter skinned vessels? Or is it AP for shooting under the waterline?

I've got another question as well, another thing I've searched for and can't find. The game crashes with 100% certanty every time I launch my, ummm, launch. Either to drop off people or supplies, the hame goes to a black screen, hangs, and eventually crashes. I can't find reference to a fix to this. Does the 1.2 patch fix this, and do you need to start a new career after every patch?

KBK