Drilla your information are not correct. First of all, API is better than more up is the number and you said the BJSA is better with (20° API) than Polvo with (30° API) you said heavy. Polvo API correct is 20° and BJSA is other. I think you change the numbers.
Drilla, your information about GDS are not correct in your post that GDS have 6.56%. This information that you posted is very old. In according new information by Petrorio showed, the new percentual is other, as described and in link below: