Spouse settlement visa - Chennai timeline 2015

Spouse Visa applied: 23-2-2015
VFS Location: Bangalore
April 8th: received email from Chennai BHC that the application is not straightforward....
April 9th: Received email from Chennai BHC to provide 2 additional Documents
April 15th: Document courier received by embassy
April 20th: BHC confirmed that the documents are received and linked to my application and sent to the ECO for further review
April 29th; Still waiting for an update, called the helpline number and they informed that the application is not updated from April 8th and the status is "delayed due to further enquiries"

Anyone else in same situation? Seems like ECO has not yet picked up my file after providing additional documents. Any idea what happens behind the scenes and how they decide to pick up the file.

How much time it takes once we provide additional documents.

Please continue in the India settlement application timeline thread where you've already posted