my vote is ride it and see how bad the stretch is. If it stretches too much then go the half link route. I have not used any half links so I can't really give ya any suggestions. I had the same dilemma for my newest rain bike and ended up just taking my chances and have it half way in the drops. One more option would be try a slightly used chain in good shape that's already stretched and see where it ends up. my understanding is that it replaces 2 links meaning one in and one out with one link. so it would move you in one total link.