" Best time to plant a tree was 20 years ago and the next best time is now".
Try the arch supports but don’t be afraid to gradually introduce them to your training over time.
Putting something inside your shoe all of a sudden might be fine day 1 and 2 etc… When you are doing large volumes of repetitions just be careful. I do not mean to discourage your attempt to improve your situation. I do want to caution you from self administering something I have been carefully monitored on.
I also do not want to make it sound as though everyone can or should be using foot inserts
Mike Forgraves is one of the top experts in the business and he lectures around the world and goes to the World Championships and Olympics as an advisor and consultant.
If you like I can inquire about a possible Skype session to advise. It might also be possible he knows the best person in your area or can find out.
I don’t mean to suggest you have not done due dilgence with your decsion tree of thinking either.
Continued success in this exciting pursuit and thank-you for sharing your training with us.