If your Hobie 16 has a soft spot on the top of the deck in front of the forward pylon its time to fix it big time. Soft spots on any part of a hull means typically the fiberglass matting is delaminating. If one does not fix it the soft spot will likely expand, get bigger and bigger until like in this picture the hull will break off or crack, etc.
Loved this picture and had to post it. Stay tuned as I will add to this post on how to fix soft spots before a hull breaks.