Say you go to the store for some apples. You get there and they are having, to your delight apple bobbing. Now there are 10 apples in the tub and you are allowed to bob and collect as many as you can. Lets say today you are hot and you get 8 of the apples out of the tub before your time expires. You head for home, but a little ecstatic from your great haul, you drop 2 apples which roll into the street and become instant apple sauce. A little humbled you arrive home with 6 apples.
Getting 8 out of 10 bobbing would be like your mash efficiency, also referred to as brewhouse efficiency.80%
Ending with 6 out of 10 would be what BS calls total brewhouse efficiency. 60%
If you increase what you ended with it will raise that efficiency. Like only dropping 1 apple.
Software is like an instrument, you need to tune it so you can play the notes you want.
I have a large difference in total brewhouse efficiency between an ipa and a porter for example. Imagine 10 ounces of hops vs 2 ounces in the wort. You will end up with more wort in the porter fermentor than the ipa fermentor, given everything else being equal.