Good people, thanks much for responding. Those helped!
I spoke with a CIC rep today. He checked my documents have reached them, and so have the medical reports. So they have all they need (and some more) as far as my file is concerned. The ECAS status is not updated, and it may not be current always, as is my case now.
Also, advised me to resend my change of address note, so they move the visa office. It indeed has to be New Delhi, but they will take care of sending the file, and corresponding docs to the new office, and I don't need to worry if my file's stuck or lost anywhere. And yes, the reason is you can't airmail your passport outside your country.
Funny, the CIC responded to my email from Mar 10 today. That tells me they are picking up old emails now, and if anyone's waiting for responses from CIC, there's your timeline. Doesn't explain why they haven't seen my change of address email from Feb 16 yet, but they've seen some and been responding periodically, so yea, much relieved today!
Must say the CIC rep was quite helpful. Name was Alex, in case you get through to him, you'll be helped too!
So evidently, patience is the name of the game here!