Flying Dutchman build options

Looking at the Flying Dutchman as a Dutch Neptune, would it be a good option to take Doorman for his fourth skill (up to 50% damage for hits on the same target) and synergise that with the Lip for an extra 15% damage on the same target for AP shots. So a potential 68% increase in damage (including doorman’s base trait). You could then add in whatever as the second trait. Thoughts on such a build?