Imdeng, I had somewhat similar issues to yours and after a lot of research and references from Ron's blogs, came to a conclusion that getting correct BC with names/dates etc is of no value if birth registered date is not within 1 year of actual birth(or may be 2 yrs). Instead, I got Non availability of birth certificate from local municipality, affidavits from parents, school records etc to prove BC. No rfe's so far on BC.
Now, I have recd 2nd rfe for EVL and 693.