This happened a couple of times and I fall short 10% to HQ despite the same conditions and circumstances.

In the first image, you see me using up BB's with both innovation and great strides, gaining only 1300 quality in the process. In the second image, you see me doing the same thing but instead maxing out in quality and hitting 100%

In both scenarios, the rotations were kept the same (noted by remaining durability), the stacks of IQ are the same (previous basic touch hits for 221), and the quality for both cases were normal (good would show a CRIT!, and the difference between 1.6k+ and 1.3k is too low for it to be a poor)