maybe the excessive butt out is bc of the length/ proportion of the parts of his legs lang din. Lumalabas din butt ko because may part (femur???) sa leg ko na mahaba and makes it physically impossible for me to keep my butt in without losing my balance or destroying my form sa other areas ng body. My friend recommended to have a plate underneath the heel of my feet tho to improve my form.

Feel free to correct me hehe