Linearizing curves is off on every one I've done: washed out

OK, maybe not “washed out” but the contrast is terrible. The linear line is bowed upwards significantly, as if from 105 to 155. On every single one (10 of them).

What’s new is that I got version 3 of the i1Spectrophotometer. Also, I used 256 patches, and closely followed the instruction for using i1Profiler sofware and linearization.

Is it hardware? Have I done some boneheaded thing wrong? My red line should be darned close to straight, from lower left to upper right. Instead I looks like Robin Hood stored his bow there.

Do I need to start over from scratch instead of trying to linearize my previous curves?

Advice greatly appreciated here!