A couple of weeks ago Diana "cured" my problem RH turns with two days on snow.
As per skifastDDS my most glaring issues were lack of CB/CA, falling inside and some hip dump.
She had me spend a day on super phantoms to get the balance established on the stance ski with tipping of inside foot. Dialling in CB with levelling of pelvis and strong inside hand. Rather than relying on dragging outside pole tip to get CB as I have done in the past I focused on these images Max often refers to. This helped enormously.
Next day CA was fixed with pole plant to side plus forward inside hand.
The progression drill then was to speed up the change in balance with quick edge change from stance foot to stance foot, maintaining CB/CA and showing the ability to lift the inside ski at any point and not fall inside, proving stance ski balance was dominant.
The other thing Diana picked out, (without my prompting) was a further half degree tweak in alignment on my weaker LH stance foot side. It took only 6 turns on the cat track to confirm she had stabalised it. I was blown away by how such a small increment could have such a dramatic effect.
I'd suggest skifast follow similar drills, plus tweak the alignment with Greg's help.