Hi, i had also stayed in Canada more than 6 months. When i had submitted my application at Delhi, at that time i didnt submit my RCMP PCC. Bcz my lawyer told me not to submit it. So i didnt. He had also said they will only ask your RCMP PCC, if your name will clash in their system with some one who has been already got the criminal charges.
But as per the advise of senior members in this forum , i had applied my RCMP PCC, and i got it in 20 days. Around 20 days back i have submitted my PCC to NDVO. If you have already stayed in Canada in the past you didnt exceed the duration of stay , it wont affect on your application.
Just stay calm and be patience. You will get your visa very soon.
Good luck.