Keeping the tails or backins and rerunning in next run or saving till ya get enough to do another run will get ya more booze. I quit catchin at 80 proof for drinkin but save tails and run down to 20 or so proof. This gives me 1/2 to 3/4 gallons of 30 to 40 proof tails each run. Easy to see how that adds up.Its really no differnt then double running a low abv wash.
There's no reason to throw away your low proof singles because there's still usable alcohol in them. By adding them each time to your next run, they will help boost your proof and volume. I quit saving the drinking product at 75-80 proof and quit saving singles at 40 proof.
Never follow good whiskey with water, unless you're out of good whiskey!!!
Not to be picky Peachy, but I offer a small correction.
Heads
The 50ml that you throw out is known as foreshots. The heads is the next stuff to come out of your (?reflux?) still. the heads have a significant portion of ethyl acitate, and have among other tastes and flavors,a sweet taste that some people like and some don't. Ethyl Acitate also increases hangover effects. The heads have lots of ethanol as well. That is why they are often collected seperately, and then later recycled. I hope this helps you decide what to do with them.
Tails
When making neutral spirit, tails are usefull because of the alcohol in them. They can have some odd odor. They can be saved and added to a clean up run of all heads and tails, or added into the next wash when you run it.
When making whiskey, tails are the main source of distinctive flavor.
With my potstill, I collect tails as far down as practical. After re-distilling a batch of all-tails, the result is a trip into BIG FLAVOR COUNTRY. The grain profile comes across extra in re-distilled tails. This can be blended into the heart run, and aged on wood, or kept seperate and aged for a very flavorfull drink. Of course, the flavors that are produced are dependant on what kind of mash/wash is made in the begining.
I don't use a reflux, so my seperation is different than yours.
Linw sugests a heads amount of 1.5 liters, but linw is using a 15.5 gallon boiler ( I think) and that is almost 3x your size, so aproxamately 1/2 liter.
Like stoker said, re-cycle them if you want, but dispose of the foreshots first.
For my 5 gallon pot still, I throw out the first 150ml-300ml this gets rid of the foreshots, and some heads. I don't recycle , but I dont have a collumn to help seperate the methanol out as easily.