I use a 905 as well. At first, I used the 901 atty's with it and got a nice taste but little vapor. I used the 510 adapter and found that while I don't get as much flavor wise, I do get more vapor with it (I believe the 510 attys run hotter). Could be my imagination, but I still use the 510 attys with it and prefer them over the 901s on this model.
JMO