1. everyone is different so has a unique maximum dose. as you get older higher risk of dyskinesia, hallucination, blood pressure drops and other side affects so i can see where a neuro would be reluctant to go much over 1000mg.
i suggest you inquire here if you haven't already. food of course could be a factor.
http://forum.parkinson.org/index.php...sk-the-doctor/

2. i've found some generic CR to be weaker than others. i take the teva brand of 25/100IR and mylan brand of 50/200CR. i'm basing this on an experience over a year old, maybe it was just 1 LOT and the other generic has improved, dunno. again, everyone is different.
since i get my RX's at an independent pharmacy and not a chain i can specify which generic i want and if costs more than what my insurance company will pay for then i make up the difference, chains don't offer that as far as i know.