If pH needs to be adjusted, it should be done as with any other regime, pH UP or pH DOWN.That's basically what I've done. I feel like if I pay for a nutrient line w a studied feed schedule I should go by that.
I know if u don't put equal parts in, pH is off. So ... Idk if there is a way to lower one raise the other w AN
If root zone is in need of adjustment a median value should be established.
As for the management of Nitrogen while maintaining equal parts, the base feed could be halved and a PK booster added, this would at least offset the nitrogen.
But again, additives outside of the scheduled regime will affect pH so it is wise to check it, always.