Sorry if I’m out of topic now, I din’t read all the replys.
I had pretty bad downs with concerta as well. Was SOOOOOOO irritable in the evening! Than, my doc prescribed me some 10 mg regular Ritalin for an extra boost, when the concerta stops working. It helped a lot. Most of the time I take one at 16h, than I’m in a better mood for the evening.
About 6 months ago my doc made me try Vyvance and for me the effects are the same as concerta except for the downs. They are a lot smoother without, radical drops. I still take some rialin for the logner days but I don’t need it often now. Maybe you can ask your doc about Vyvance (sounds like an ad 
)
Good luck 