Squatting and Dorsiflexion after LL

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Just want to start a discussion over whether or not squatting ass to grass is achievable bio-mechanically after tibial LL or if not being able to do so is just due to limited dorsiflexion.

Squat Position Wanted:
Dorsiflexion Test:

I still cannot squat well and it bothers me. If I try a squatting position like in the video my heels come up a good 2 inches. For the dorsiflexion test I can get about 4 inches on my right leg but far less on my left (maybe 2.5 inches).

I bought a roller and balls to roll on the bottom of my feet, and have been stretching, but since you can only stretch so much in a day it hasn't proven effective. Right now I find the best stretch is placing my foot 5 inches from a wall then putting my knee to the wall, allowing the heel to come up, and then applying full body weight to the heel to try and get it down.

 Short of a tendon/calf muscle lengthening surgery I don't know if I'll ever achieve suitable dorsiflexion to squat, or if my new bio-mechanics simply means the squat position is no loner biomechanically possible.

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Use powerlifting shoes in the gym. But yes... without those you probably wont be able to squat normally because when you go down, the kness go forward and since your achilles tendon and calf muscles are already streched, they can't stretch enough to keep your heels on the ground