What is your Set up on the 910. you know you could have set it up to be almost a 10 degree. and then what flex is your shaft.

Set up is D1 and flex type is stiff 72 Ahina.

OK yes the Ahina is the new White board basicly. um you didnt mention if the new shaft is tiped. tiped shaft produce a lower launch. Try setting your driver up to the standard A1 for a few test swings see if the ball acts more like your 909. Also i didnt catch your face angle of the 909. sometimes lower face angles have a backward affect based on your swing type and shaft characteristics. there are a few Pros that use 10.5 that his shots that look like the same as guys using 7.5's This is all the pros recomend getting fit for your clubs. Try this and post results we'll see if we can fix this.

I just bought the 910D3 9.5 Degree Stiff Aldila Rip 60 D2 setting. So it actually plays like a 9 degree. I get a low penetrating ball flight with this set up. Just a suggestion, get fitted on the laucnh monitor, the simulator, and try it on the range. This is what I did before making the $400 investment. It gave me a different perspective for each test. Also, you might want to try out the Aldila Rip60 or Rip70! Just my 3 cents...