Of course.
The first, and most important point, which you no doubt already know, but in case anyone reads this who doesn't know: everyone needs a coach, to a greater or lesser extent. No athlete or coach is immune from having issues with their lifts. And no matter how good of a coach you might be, you can't watch yourself in real time, and yell appropriate cues at yourself based on those observations. Videos help, but they're not the same because you can't correct anything until the next set. Not only have you missed the chance to fix some reps, but 1. That might be the only set you have (i.e. a 5RM on TM Intensity Day) and 2. Doing more reps that way may further establish the bad habit.
Further, I personally get stupid when I watch my own videos. I just can't help but be biased and am not as good at watching and analyzing my own videos as I am for others. I'm getting better at this, but still not equal.
Now, onto the substance.
In the past, I've fixed this issue using two main "thought cues."
1. The Master Cue (see book for details)
2. Thinking Knees OUT throughout the entire descent.
Sometimes one, sometimes the combination of both of these, would help solve my knee slide issues, which I suspect are primarily a result of having high bar squatted for years before learning and switching to the low bar style.
In this case, I was doing both of those things and they weren't helping much. I had managed to not get so far forward that my weight shifted onto my toes (which has happened in the past), but was still showing clear knee slide, losing hamstring tension (and thus involvement in the movement) at the bottom, as well as displacing the bar 1-2 inches forward of the mid-foot.
Steve, I believe correctly, traced the root of this iteration of the problem to my back injury. I had a pulled muscle in my deep right lower back, that took about 2 months to heal fully (late Dec to late Feb). When lifting, the muscle was most bothered by deadlifts, but the bottom of squats made me nervous too, even though I never felt it as much during squats.
We believe I fell back into the knee slide, which I had previously eradicated, as a protective mechanism for my lower back. I was trying to artificially create a more vertical back angle to reduce the moment arm from bar to hurt low back muscle. This created a strong habit and pattern that my normal self-cueing didn't fix.
I won't bore you by relaying the entire 30 minute conversation, but what worked today (other than a few reps) was getting my knees forward first and then exaggerating the lean-over in my own mind. At the top of each rep, I would just think "lean WAY over!" And to be honest, after a couple months of knee slide, it felt weird. I felt so horizontal and as if I was sitting back way too far. But it worked, and I got more used to it as the sets went on. I could feel it more as "mid-foot" rather than "back" after a while.