You know...
If it's at nighttime, & you feel stressed & a little burned out, it might not just be ADhD. I think lots of people feel that way at night & when they have lots to do. We're different, but affected by normal ups & downs of life.
I think because we take meds for one aspect of ourselves, we have to be careful not to attribute everything negative to that one aspect we've had problems with & been able to medicate. Otherwise, we can end up thinking everything would be better with medication & then we're trying to medicate for everything.
You can probably experiment with your dosage within reason, but if you're feeling like doing it later in the day, try taking a nap. Maybe spread out the doses you take? Snack...?
DJ