Least amount of low wines for spirit run with a 1/2 keg?

[booger68]

Hi all another couple of questions for ya.

What is the smallest amount of low wines i can use for a spirit run?

I have about 3 1/2 gallons of low wines that i have stripped i will be cutting it down to 40 abv tommoro but this is a slow going with only 2 6gallon fermentors?

I have done 2 strip runs now and i have removed the forshots On both but i still have them (about 2 quarts worth).

Should i dump them back in when i do my spirit and remove the forshots there or should i leave them out and start right off collecting?

Thanks
booger