Same problem on our '14. Door closes easy enough - with two clicks - from the outside, but we have to really slam it from the inside in order to engage the deadbolt. If that isn't done then the wind noise is heard when driving. Have not seen any water infiltration at all.
Since it closes easy from outside I'm thinking if I adjust to make is easier to close all the way from inside that I'll wind up with more wind noise .
2014 390RB-60 "The Shire"