You need to figure out what the deal is with your new salt. Mix up more batches or something, because if it's what you're going to be using, are you going to do this rigamarole every time? My advice would be to check the calibration of your refractometer before you start trying to dilute your freshly made saltwater. Its possible that your refrac is off and maybe the true salinity is like 1.028 or 1.029 which would explain the higher alk.