Button "Return to previous question" visually seems like another "disagree" level

[or]

I have no research to back this up, but while taking the test the "neutral" button never felt like the middle ground, because of that last button. I understand what it is for, I understand that its colour sets it apart somewhat, but even with the knowledge I noticed a couple of times how I perceived an imbalance between "agree" and "disagree" section, just because there seem to be more buttons.

I wonder whether it would be prudent to lower it further away from the test answers to avoid this, or even move it elsewhere (idea: it could be an arrow or somesuch directly in the header "Question X of Y [back]"), so it is clearly orthogonal to the answers.