I use a latex neck seal for my Andy's DS2 suit. I have a very big 18 1/2" neck that is approximately an inch long. I have trouble trying to get my seal to lay flat. It always rolls up on me. I see that neck seals are sold in sizes at DRIS. Should I be ordering their 2XL seal for me? Do you think this would sit better on my neck assuming that trimming average size neck seal would probably still cause it to roll? The neck seal is snug but does not restrict breathing in anyway.