How to Squat Properly ?

I've had a row with a physiotherapist face to face because he was insisting my left leg was not shorter. The idiot pushed my right knee with the heel of his foot while I stood causing pain and making it all for nothing by being in denial about the left heel rising of the ground. He kept telling me I rose it and that I just need to flatten it. The last paragraph explains what happens because of this when I train. My left leg is 2 inches shorter than my right leg because of a hip injury. This means squats are two dangerous for me. I get problems with the hip from standing OHP and Romanian Dead Lifts and especially farmers walks. Afterwards and for about two days the left leg feels like it is dislocating sometimes when I stand. The pain is in the dent of the left glute. I have to do unilateral leg press to compensate for Squats and I have to start Romanian Deadlifts with the barbell racked at thigh level. When doing any standing lifts the main problem this imbalance causes is severe stiffness and aching in the left lumbar muscles. Seated OHP and other seated exercises don't work my core and legs at the same time, so I avoid them while I can. My right medial delt and right trap sometimes look less developed because I stand with my shorter leg with knee locked for hip stability while the right knee is slightly bent. Locking the right knee lifts the left foot of the floor. I do extra lateral raises on the right shoulder in the week to keep on top of that, and a few sets of dumbbell shrug.

I noticed on myself that glutes muscles activate far better when i maintain an arched posture ( in my lower back ) when lifting than when using a traditional correct posture ( in the case of a person without scoliosis ) . In that case i feel no glutes working but mostly my lower back. Scoliosis in my case implies a hyperlordosis. I have a c shaped dextroconvexe thoraco lombar scoliosis. When i lift i try bringing my hips forward so that the legs would lift the most of the weight and not the lower back. Also , the knees are behind the toes.

I had already recognized my imbalance but tried it through pressing harder with my left leg. All the time it was my right(paradoxily my strong) leg coming inwards and cost me a lot of concentration to only keep my knees out that I could have use otherwise. It is all about my glutes not squeezing evenly.