EverClear does a MUCH better job of extraction. However, sweetening is much simpler with 80 proof vodka. I make a 1:1 sugar syrup, and use 1 cup syrup with 3 cups limoncello base, to produce a 60 proof result.I also use Everclear in my limoncello. powerful stuff.
Using 150 proof EverClear, I had to use Pearson's Square to figure it out. Once the spirit : water ratio is figured out, then I have to determine how much sugar to add to the water, as the ratio is less than 1:1.
I recorded how I figured things out. Now I just need to find where I put my notes ......