patrol 10- first time i sunk 8 ships, and some heavies at it. Sinking rate should improove from now on, as i just picked up brand new IX.
As to sinking passenger/cargo- i have no morale or tonnage problems. As long as it has enemy flag on the mast i will strive and find the best way to sinking it.
Sloops, and fishing boats provide my deck gun crew with valuable targets.