Not good to assume anything.
The coxa valga is a deformity of the hip where the angle formed between the head and neck of the femur and its shaft is increased from the normal 130 degrees. This structural deviation reduces stability of the hip in the neutral weight bearing position.

You may need to use a wider stance when squatting due to the structural deviation in the angle between the head and neck of the femur.

Taking 2 months off of something is going to impact where you are at and the weight you move.
When was the last time you did sumo squats? Sounds like 2+ months ago or more.
Rebuilding your squat mechanics is a good place to start. You are now aware of a structural deviation which may impact your foot placement when squatting. Feet remain straight w/ 5-11 degree acceptable turnout.
I recommend working with a coach on the width of your foot stance and squat mechanics/technique.
How is your ankle range of motion/movement progressing?
Earlier you said you have very tight quads, and IT Band how are these progressing?
How are the QL and psoas progressing?
Impacting factors when squatting which can impact..

How do you know the adductor/hamstring interfere is weak?
One to check out
Wednesday, July 22nd, 2015
Works some down stream as well.
If you are addressing this and not seeing change then there are a few things to consider.
Are you spending enough time/long enough doses when working on it?
You maybe trying to do too much during a session. Keep it simple spend quality time.
Re assess how you are addressing it.

Positioning when completing any task is key.
When you contracted your glutes “hard for a few seconds” you reset pelvis position.