So recently after doing a heavy set of back squats and having more lower back pain than glute pain, i was forced to look at my form… anyway the problem is when going Atg i round my back near the lower portion of the rep,i found a good fix for this is two 10kg plates, one under each heel. This allows me to complete a good clean ATG squat… is this a good alternative? or should i work on my flexibility/strength to be able to do them properly?