Port area for two nvx vcw 15’s

[High Dro]

I’ve been struggling with how much port area I should go with utilizing the stated subs since I don’t have a laptop at the moment I don’t have a way to model it to see what work best for my application I’m going for loud deep bass in the mid to low 30hz area but I’m unsure if I should go with 70 square inches or 80 square inches of port are the box would be 5.50 cubic feet I’m not trying to end up with too much of a peaky box because I’d like it to sound good any suggestions and advice would be appropriated