Should I reset and drop the weight down 10lb on squats?
It's one of those grey areas. Ten pounds wouldn't really be very much for a full-fledged back off. You'd want more like 20. BUT sounds like you're saying you haven't increased due to the feeling that form is bad so you havent actually started missing reps or anything....
Rip never says thing one about form following along with your "progression" but I'd say progression at the expense of proper form ain't progression as I'm sure you agree.
So the question is what is enought to get you going without needlessly disrupting things? I'm going to go with doing a real backoff because I doubt just dropping 10 will be enough. If you drop the weight by 10% (rounded down) you'd get 20 lbs. That would probably be the way to go and just bring it back up 5 pounds at a time. Hopefully that gets you going again.
Also, you you could also change one squat workout to higher reps with submax work. Meaning less maximal than the 3x5. It could still be somewhat challenging but not all out max efforts. In other words something like taking your 10 to 12 rep maximus but doing 2 or 3 sets of 8 with it. The advantage is working on form, getting more practice with a manageable weight.
It's going to be hard to progress in this super fast linear fashion with it feeling like you are always lifting the same though. I do want to point that out. As you load the bar, things change in terms of muscle firing and the relationship to lower and higher joints. So sometimes when we think our form is sucking it's really just the reality of putting so much more load on the bar so often. If you were to "measure" everything about a guy squatting a certain weight one time, and then a few days later him squatting 10 lbs more, the measurements would change if that makes sense to you. And there is not a damn thing he could do about it if he is to lift the weight.
A person can always do one or two light back off sets, even on SS. This can help you feel like you have reinforced your good habits under the bar.
Good job, btw.