Did 1.3 or 800/900 change 600/700 FDs?

I never updated to the 1.3 update with the 600/700, but had to for the 800/900 package. I've only flown a few times, but it seems as though the flight dynamics are very different in the smaller models. I feel as though my hand flying on approach and landing is pretty bad. Am I delusional or did something change? I was getting pretty good at manual landings.Also, I had to perform a go-around tonight when the FMC was unable to descend to 2000 on schedule at GATTO (ILS RWY-9 KSAN). It pretty much overshot even though I only changed that one altitude in the LEGS page. It didn't seem to like the downwind/base approach at all. When I setup for GA I set the AP to HDG and tried to climb to 5000. The MCP gave me trouble when I tried to select the different modes; Almost as it had done before the switching logic was fixed in SU2. I have seen a CWS annunciation pop up in the EFIS or PFD even when I'm not in CWS mode twice. Switching to certain modes in the MCP seems to cause this even though I'm not touching the yoke or hitting the CWS buttons. Any ideas or just a fluke?Thanks in advance,Chris :)