Honestly do we need more alk and calcium than the higher end salts already provide?, unless you have a huge demand for it.
In my opinion yes. Less dosing is always good in my opinion. Here is a chart on the Salinity values...
NSW Min Max
ph 8.5 8.4 8.6
Alkalinity 3.5 meq/L 3.2 meq/L 3.8 meq/L
Calcium 422 409 435
Magnesium 1,336 1,296 1,376
Strontium 8.4 8.1 8.7
Bicarbonate 214 208 220
Borate 15 14.5 15.5
Bromide 65 63 67
Chloride 19,000 18,430 19,570
Iodide 0.06 0.0582 0.0618
Sulfate 2,655 2,575 2,735
Potassium 380 369 391
Sodium 10,500 10,185 10,815
Cobalt 0.0004 0.00039 0.00041
Copper 0.0003 0.00029 0.00031
Iron 0.01 0.0097 0.0103
Manganese 0.002 0.00194 0.00206
Molybdenum 0.01 0.0097 0.0103
Rubidium 0.12 0.1164 0.1236
Zinc 0.01 0.0097 0.0103