Do you ever take Aderall Immediate Release (IR)? I take 20 mg XR and 40 mg IR and that works the best for me. Sometimes I'll forget the xr in the morning and only take the shorter acting dose. Either way I find either a combo of XR/IR or the IR alone to be more effective than the XR alone. I think it does also have an antidepressant effect, but then a bit of a crash after. Not as bad as with Ritalin, but I can feel it sometimes. Maybe that is it? Perhaps asking your doctor about combing the versions will give you more options. Then you can control the timing of your doses a little more. Good luck!