Yes, I have had similar response.

What to do?

You probably will do much better taking a small dose of immediate release methylphenidate about every two hours through out the day.

Talk to your doctor about it. Be forewarned that unless you are seeing with a psychiatrist well-versed in ADHD, doc will not believe/understand your response. Your response is not all that unusual but it is poorly documented.

I doubt if you'll experience any improvement over time sticking with the Rit LA.