If you are a solid 9 in Aberdeen, I would go with 8.5 in the Tremont. However, it really is a tweener if you poll people that have them (half will swear by TTS and the other half will say size .5 down). I think you just need to try two sizes and figure it out for yourself. Good luck and let us know how it turned out for you!
Thanks - we shall see how they fit.