I was playing records and cd's for about an hour or two trying to feel out exactly what you're saying but couldn't quite nail it. It definitely has a weird curve. The last 20% feels kinda flat, but right at the end I noticed it kicks up a bit. It just doesn't feel linear by any means. I'll get hell for this but quality aside the Pioneer faders on an 800 feel nicer and have a more linear taper imo. In the end I'd rather use a rotary any day of the week, but again, was just expecting a bit more from Rane on this one.
I'm curious how the DJM1000 is, I've never seen one in person.