(g)You might also need to ride with a shorter stirrup.
Are your stirrup bars back far enough? Are you riding with a tilted pelvis - the front corner with the outward pointing toe corner up, and the other one more horizontal?
having my right toe out is something I have been fighting for years, and trying to use muscles to pull it inward wonât help if the center of your body (pelvis) is not positioned symmetrically. Just do not arch your back.