I would give it a week or two before you make a determination on if the increase is helpful. It may be that Vyvanse isn’t the right medication for him. There are two types of stimulants: amphetamine (Adderall, Vyvanse, Evekeo…) and methylphenidate (Ritalin, Concerta, Quillivant…). Almost everyone does well on one type or the other, but not both.
The details on medication in this article may help you with next steps:
ADDitude Community Moderator, Parenting ADHD Trainer & Author, Mom to teen w/ ADHD, LDs, and autism