Time, turnout, and hand walking really are transformational. I think that magna/bemer/chiro/etc are all great but honestly the time usually makes the biggest difference. Just like when we strain things, the supportive therapies are helpful but there is no shortcut for rest.
Horses are a wonderful and stressful endeavor. COTH can be a baptism by fire but there are genuine experts on this forum. There are people who have worked for Olympians, ridden at the top levels of their sport, work for top teaching hospitals, etc. After 20 years of reading I am still learning from this group.