This webinar with Dr. Dodson is really helpful for tweaking ADHD medication. There may be something in here that sparks a clue on next steps for you.
Also, citric acid (found in citrus fruit and juices, but also in soda) inhibits Adderall and should not be consumed within a few hours of taking meds. Could that be part of the problem?
ADDitude Community Moderator, Parenting ADHD Coach & Author, Mom to teen w/ ADHD, LDs, and autism