What's wrong with leaving the salt out of both the base and paste and then season the finished dish to taste?
The basic answer is that things seasoned during cooking taste better. You'll notice this the more you cook.
From what i have learned from chefs i respect (gordon ramsay, heston blumenthal, alan murchison, the chefs who taught me) you should be cooking with salt so that the flavours are balanced/perfected as you cook. When seasoning you are trying to enhance the flavour of the food so it seems to make more sense that the salt should be used when the flavours are coming together. At the other end, adding salt when the food is on your plate kind of just tricks your tongue into thinking that the tastes are balanced.
It's hard to put in words really but the best chefs do it so you should too! They also seem to do it at BIRs, most importantly!