consolidating medical school loans - Accommodating resistance
200 pounds of band tension for a 300 pound raw squatter is pointless, but for an equipped lifter the situation might be different.
The risk of accommodating resistance is exactly that, of creating a strong top portion of the squat but neglecting strength at the bottom.
For avoiding a weak bottom half, apply pause squats, box squats or squats hanging from chains/rack.
I would suggest using less tension from the chains or bands, as in around 10% of the total bar weight.
This will create an effect, but it will not create a weakness at the bottom of the squat in the long run.
The differences that powerlifting equipment bring to the lifts has created much confusion with people interested in the method of accommodating resistance.