Has anyone switched from extended to SR?

I'm looking for others experiences. I'm on 150XR (for ADHD) and I'd like to go up to 300, but even after 7 months I still cannot sleep at night without a LOT of extra help.

I considered doing one higher dose of SR early, but not the second dose, so it's worn off by bedtime. Something I read said it would be less smooth and not ideal.

My Dr says "ok sure thing" to whatever I suggest, rather than having a strong opinion, so I'm trying to do some research before I go ask him if it's a good idea.