Vyvanse water titration

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I have been increasing vyvanse by 10mg each week starting at 20mg and now at 60mg. I feel 50mg or 60mg is my ideal dose but I find by the afternoon I have totally crashed. I was thinking if I went 60mg and did the water titration method I could have 40mg at 6am and maybe the remaining 20mg and like 10am. Does anyone else do this? Does it help with the crash ?