the ridge lines were added when triumph changed the high density foam formula and found out it heated up as it cured and the sides had to be stiffened to account for the heating up of the foam. as for the bulging this is the first i recall but hopefully it came be resolved with the factory as it shouldnt be doing it enough to be noticable when looking at the side. i would get it to a dealer and let them look it over as i don't think it has anything to do with water in the inner hull.
just my $.05.
GGC
P.S. you can drag it down to NC when we have our local owners meeting and get the answer first hand!!!!
