I've done two brews using my coolbox mash tun and I'm trying to get my head round strike volume and sparge volume.

Should the strike volume be increased to account for absorption or should it be made up in the sparge?

I've done it both ways and got slightly better results by increasing the strike volume to cover the absorption before sparging.

So I did a 14 litre strike an 20 litre sparge first time, and the 2nd time I did a 20 litre strike and a 15 litre sparge, I was in the right ball park both times in terms of S.G. I'm just wondering if there is a "correct" way.

(Those numbers were based on the instructions in the book + 1l for my mashtun deadspace.)