So sorry about your foot pain! My guess is that you are trying too much too soon, regarding all the focuses. Remember that law of gradual progress? This applies to any transition (mileage increase, going to a more minimal shoes and in changing your running form). Try going back to one or two focuses such as engaging your low abs (enough to stabilize the pelvis, but not too much that you create tension elsewhere) and lengthening your spine (feel as if you have a balloon attached to the crown of your head, gently pulling you upward as you land). Only pay attention to these two for now, and as you get comfortable in them (this could take months, depending on what habits you have to unlearn), add in another focus. But definitely adhere to the law of gradual progress.
In addition, pay attention to how you move and stand through out the day - not just when you are running. Keep coming back to good alignment (check your shoe laces or a mirror). Your body loved repetition and that is the best way to incorporate new habits.
If you have an instructor in your area, make an appointment with them or attend one of their workshops. It can clear up your understanding and issues pretty fast!
Chi Running and Chi Walking Certified Master Instructor