Well, my recall is meh (a bit better than your, it sounds), but I can perfectly remember both LDs from the beginning of the month.

Dream recall is mainly used to find out dreamsigns and, in my opinion, often answers some questions or problems I have in waking life. Also, for your last question: I don't think so. Our dreams are chained together, but they are in bits. I often ask myself how I got to a place, only to figure that a new REM segment has begun. I'm pretty sure there will always be gaps.