We are having same issue here. Apparently the max effective dose has been set in stone and is below what many people have been taking. Recommendation and therefore the new guideline ( from Epocrates webpage) Adderall for ADHD
[5-40 mg/day PO divided qd-tid]
Start: 5 mg PO qam or bid, may incr. by 5 mg/day qwk; Info: duration 5-8h; give divided doses at 4-6h intervals; doses >40 mg/day rarely more effective. Elsewhere on the site it lists health risks associated with high dose, including heart attack, stroke, and kidney damage.
Your psychiatrist needs to consider why your current dose is not working well. ADHD often comes with other disorders and treating them may help. And working with an ADHD coach is helpful if you can access one.