When a recipe calls for a %, it usually means of the whole, unless they specify a certain ingredient.
If it were me, I'd go with 1% of the total since that'll probably he a higher amount. But that would certainly depend on the percentage of hemp and grapeseed you're using. But calculate out the amount you'll need using 1% of the total, then 1% of each oil. It may come out to be very close.