I know his form was not that great on that lift, that was why I am asking for advice/assistance.  
 
Please don't judge the whole progress on just that lift though...It was his first session going up in weight.  We got 5 or sometimes 10 sessions progressing 1 more lift each session before we move up 5 lbs and do it again, so I am not attempting to push him forward with any degree of speed, I only want him to make just a little progress (of one more rep)each session.
 
We do have some issues with depth, but please remember that we are doing low bar, so just breaking parallel is our goal, not the ATG of a high bar squat. (I am sure you (Koing) are aware, but this is also for others reading too).
 
Please also take into consideration 
this lift from a few weeks ago that I posted on the SS forums.  The advice I got on this lift was to have him get his toes pointed further out, and to adjust his neck to a more neutral position. 
 
To be fair, the main person also felt the bar might be a little high, but I disagree with that, this is as low as we can get and keep the bar stable.  We might be able to do a little lower as he gets older, but this is the best we can do for right now.
 
Lastly, why would I not do a "strict" rep range? (meaning, why would he not know how many reps he wants to achieve for this session?) I would expect him to have to push at least a little, and as long as his back is not rounding, and he is not doing a good morning (I don't feel he did either, even on the most recent lift), I don't feel he is in any danger of hurting himself.  
 
Am I totally off base?