If the 6W fit without baking, I might even try a 5.5 or a 6R. They open up significantly. Baking is an absolute MUST in trying these on. I would not go for the 6.5. I'm in size 4R, and constantly debate whether I could go down to a 3.5. I have some room, but my ring and pinky toes are slightly more than brushing the cap, so I've stuck with the 4, as I think the 3.5 would be uncomfortable on those toes even though I have a bit of room on my other toes. For comparison, I was in Grafs in a 5W and Ribcor in a 4.5D to get similar length and width. The TF7s are still wider than either.
Most of the shops around me have told me they do not recommend the saran wrap method. I still don't understand entirely why, except for the time involved. A good compromise is to have them "massage" the warm boot around your foot. I just did this on a second bake of my right boot, pressing in on the ankle and heel area and it seems to have tightened it up.
I just picked up a pair of TF9s as well and the difference in the tongues is noticeable. If you feel like you need a bit more volume and room in the TF7, check out swapping the tongues to the thinner TF9 version. I'll have my first skate on them tonight and can report back how they feel in action.