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Well yeah but it could also mean that in that harder position the low abs might not be able to hold you from collapsing backwards, for example. Or by elevating the heel you alter the recruitment and participation factors of different muscles.

And then it could be what you say, who knows?

I have two comments:

1) Your GHRs didn't look bad at all. I think you should focus more on starting from a posterior pelvic tilt and try to maintain those glutes firing, even if you don't do a good job at it initially

and

2) Focus on improving the bar speed on the paused squats rather than upping the weight and continuing to do them slowly. Think of the bar speed as your barometer of improvement. If you squat the same amount of weight but you do so in a faster manner then that is IMPROVEMENT, and it could be a MUCH better improvement in your particular situation that you're in now than if you were to just increase the bar weight and "get stronger" in that way.

In that regard, I would up the weight if all your say 5 reps were fast on the concentric (fast for the standards that you set) and also you felt like if you were to go all out you would've done 7 reps with that weight. If these two conditions are met then you up the weight.

At least this is my opinion.

Do you have a GHR machine?

Very interesting discussion... I remember when I was doing the chezkenny routine which called for squats + bench press + deadlifts + chinups every day and that's when I set my all time PR in the squat in terms of 5RM. Obviously and increase in movement efficiency but was it really JUST that?