What running technique training would you suggest? Chi, Pose, Barefoot, or some other?
I don't feel qualified to recommend specific techniques, but my approach would be to follow sensible and individually tailored advice from a sensible running coach who doesn't follow one style blindly. We are all different and I don't think one style fits all.
Minimalist shoes that may help you land midfoot may be better for knees, but come with a whole world of other possible injuries. Kinvara's probably a sensible option over e.g. drifts. It may be best to invest in running technique training instead