Hi Kwaiyai,
9 degrees of pitch attitude prior to landing sounds bad enough, but after landing sounds to me that they are actually having to pitch up to achieve it. I think you fly 737 ?. As a co pilot you have an obvious responsibility as well as said captain for safety. It can however become an issue with seniority, experience etc. Make reference to how you were taught on line, query his technique, mentioning effects on pitch attitude with speedbrake deployment, reverse thrust and especially gusts, shear etc. Ask where they learned it. Being tactful is never that easy for any of us. Get the boeing flightcrew training manual out as a reference item. If all this falls on deaf ears then tell them that you would prefer that when you fly together, they adopted the boeing technique on landing. Alternatively, you must have some form of confidential reporting, without naming names, thus keeping both parties happy. This would hopefully lead to your training department issuing a reminder on correct techniques to be adopted on landing, maybe combining it with other approved techniques so as to avoid this captain perhaps feeling targeted. Discuss the issue with other F/o's. If these things fail then have a quiet word with a line captain who you trust, and ask for their views on how to approach the obvious problem. Good luck, Rgds.