Hi Shawn,
Thanks for being such a patron of Mares. We appreciate it! Unfortunately there is no real product to solve your situation. The way I see it is you have two options. 1 is to cut and resew or glue. It is not that complicated of a process, although anytime you cut and glue the integrity of the neoprene is compromised. Although, neoprene cement works really well. Should you cut, use a very sharp pair of scissors or exacto knife and cut a wedge out and reglue. This will effectively tighten up the seals. Alternative 2 is to get a velcro type strap (like a wrist watch) and gently cinch up the extra material. Maybe there is a local wetsuit alteration company? If you think their bodies will not change too much before the life of the suit expires, I prefer alternative 1.
Hood goes on last. When neck collar is rolled under, there should still be some of the "metal skin" material exposed. This is what the metal skin seal of the hood should come in contact with. Skin on skin so to speak.
Your warranties are in effect do not worry about this. Although if you go Dr. Frankenstien on the seals of the suits, we can't cover your handiwork under warranty. Be sure to save all receipts as this is most important to us.
Sincerely,