Don't know anything about how the tacks fit.
That said: I was a perfect fit in the 8.5w 705. I find in the 8.5r PK7700 the forfoot and length is the same, the heel feels a little wider. Volume seems about the same. Less volume than the 9035, narrower heel.
I came from an 8.25d mako2, the heel is wider on the pk7700. Nice and light though, which I feel too many people overlook in a skate.
That's what I have,
Zach