Ports: When you assemble your camera in humid conditions you can develop fog. Try to assemble in dry enviroments. You can also gently shoot some dry air from your tank into the housing just before you seal it. Some claim that dessicants work well. You can go to http://www.desiccantcity.com/ to check them out. From another forum, "the type that use silica beads like those found in Nikon packaging and many other Japanese electronic packaging are the best, no powder."
Also, "Use the indicator kind, the ones that turn from blue to pink, so you know they are good, and give them as much time as you can, they absorb a lot in the first hour and level off after around 5 hours."
Also, the OLY housing is a lot smaller and easier to fog. Just make sure you assemble the housing in a dry place like the galley area or in your bunk room, or house.
Retractors: I have a large clip on my BC and a LARGE D-ring on my housing. If something happens where I need my hands, I clip the housing on to my bc, but it is very easy to disconnect with the big clips. There are times I do need to use two hands, like when decompressing (did I say that?). I like to have one hand on my computer and the other on the anchor line when in heavy current. Some will say that they never connect the housing to their gear. You cannot NOT do that in hard diving conditions unless you are willing to dump your housing and buy a new one everytime you are in a situation. Don't get me wrong, if I get into a situation where clipping the housing on my BC will cause further complications, I won't do it. But in 20 years of photography, I have never had a problem getting out of kelp or any other situation. I would recommend not to use an elastic connection. You need to always know where your connection is by feel. Mine is right near my right areola :wink:
Joe