I also use Bru'n Water, and I prepare my strike and sparge liquor separately, as I heat the strike volume in my bk prior to underletting the grain in the mlt, and at the same time heat my sparge liquor in the hlt.
There are multiple reasons: primarily, two burners make heating the total brew day water needs quicker. But beyond that, the strike volume temperature is almost always a good 10°F higher than what I'll run the hlt bath at, so I avoid wasting the energy (and taking the time) to bring the sparge liquor to the strike temperature just to shed all that heat (and taking more time) before recirculation starts.
Bru'n Water handles the salts and acid additions separately quite nicely imo, and from all appearances, with the exception of the acid addition for the strike volume vs the sparge liquor volume (the latter barely gets a half milliliter) the profiles are identical...
Cheers!