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Vyvanse 70 mg. In the am 2 hours before academic classes should last you 12--14 hrs. If not, try adding intuniv, the only fda-approved adjunct for treatment of adhd. You may want to take it at night, as it causes drowsiness for a few days after each weekly dose increase during titration from 1-4 mg. For optimal effect. Branded Concerta 72 mg + Intuniv also may work.
There several reasons for stimulants to be uneven in effectiveness, with sudden changes in blood levels, tolerance, metabolic clearance, etc.
One remedy involves adding a small dose of Adderall or Dexedrine as the vyvanse wears off. This can apply to shorter acting methylp forms as well.Extended release forms have not worked for everyone. Adding nonstimulants to " fill" gaps may help - bupropion.
Chose your stimulant.
Don't combine stimulants. Longer acting agents tend to provide better coverage without sudden crashes. Given your need for such high doses i would expect a major issue is being neglected: regular restful sleep. Good sleep may allow for much lower doses of stimulant medication. Benadryl 50mg may help improve sleep. A switch to another adhd med like Concerta may help as well.