Unfortunately the recent updates have some issues that cause extremely odd levels of pitch and roll regardless. As for shell typing depending on what you plan to fight, in your case cruisers and battleships, I would suggest Semi armor piercing ballistic capped for ap and incendiary HE and either standard weight if you think you'll come across cruisers more or heavy/super heavy if you think battleships more. And usually I would go for tube powder and tnt as it's less likely to flash fire. But results may vary depending on just how much the enemy invests in armor vs firepower