i don't put shrimp paste in mine but i make it with fish sauce i can give u the way i make it. i love sour mangos.
this is the liquid sauce:
man i don't know my measurements, but here goes:
using a small bowl for sauce, put in about 1/4 of the bowl the fish sauce
about 3 spoons of sugar
about 1 & 1/2 of ground dried red pepper
1/4 spoon of msg [you don't really need it]
1 spoon of ground rice that has been burned so it's brownish [kao kore]
mix it all together and stir, you're get a thick sauce, but if you prefer watery, add more fish sauce, or fix it to your liking.
this way is sorta like the thai nam plah warn. and i prefer it refrigerated.