Hmmm. I use TDW´s IRAI since first version.
I try to deactivate IRAI and activate your mods in the following ranking:
1) Historical Ship Equipment 1.3
2) Additional Merchant Ships 1.0 (part 1)
3) Additional Merchant Ships 1.0 (part 2)
What other mod except IRAI exists, respectively what do you use?
Thank you Cerberus62!