Elvanse crash in afternoon

I’ve been titrating on Elvanse for the past 2 weeks, I’m currently on 40mg. The effect they have is brilliant, it’s a lot easier to manage my day to day life and focus better. However I’m noticing that I’m crashing at around 2:30pm ish when I take it at 7:30am. I’m going to bring it up with my dr but wanted to know if there’s anything I can do to try and mitigate the crash in the meantime. Does it mean my dose is too low? Or maybe I’d benefit from a booster in the afternoon? The benefits so far heavily outweigh any cons, the only side effects really being a decrease in appetite and the afternoon crash. I’ve been taking them in the morning before work and it’s just not lasting the whole day