Hi there, late reply to your post, I know...BUT, I have the P9 setup and marine pack also and really like it. I have been using a 50w video torch which can produce some hot spotting and motion shots are a bit difficult as well. There is a little "shakey hand" that you will see quite a bit at first on the viewfinder.
I am going to replace my torch with a digital flash set up soon (I hope) for better pictures. The filter is an absolute must and well worth the extra money.
We have dove it down to 126 without leakage and have had no problems at all. A little anti-fog on the inside of the housings lens surface goes a long way.
Best of luck, look forward to your shots!
Joe Honu