I need some serious help with squats. It's the only lift

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I need some serious help with squats. It's the only lift that I have zero progress on after a year of lifting. I've watched every form video imaginable. At first flexibility was an issue so I loosened up my ankles and hips which were the offenders.

The issue is I can't lift a consistent or decent weight. I weigh 162 and last week I could lift 185 x5 this week I could barley do 135x8. My chest is out im sinking between my knees back is straight toes out,knee over toes never in. And yet it never feels right and no progress is made.

Some things I've noted that may help in suggestions. As i mount the bar on my bsck I feel tension in my lower back unless I flex my abs(which I always do when I squat anyway). Coming down,just as I begin to reach Paralell I feel a slight shift forward and a battle between my hips and lower back until I reach parallel where that goes away. I have no explosion out of the hole,I just can't,it's a slow movement up and I have to tense my hips and lower back a lot to get out. In the beginning i csn hsrdly reach parallel without my a really tense mower back. It takes several sets of shitty quarter squats before I can comfortably sink into the position for working sets. Appreciate any advice