I think you should figure out how your system works instead of going by his instructions of adding 5qts. I did this for my first all grain and i have much more boil off than he did and ended up with much less wort into my fermenter when i followed his instructions.
My system boils it pretty good. I have actually lost more than intended on my last brews (Extract) and had planned on trying to cut it back some on this boil.
I followed the instructions to a tee. It was my first AG so I was pretty nervous but it actually went well. I have to say that Batch Sparging is quick and easy and it made me feel as though it was too easy. But maybe that was because I was amped up about it.
When I finished sparging I ended up with 7 gallons instead of 6.5. So then I decided not to cut back on my boil and let it roll. I ended up with right on 5 gallons.
However my OG was 1.047ish @ 75 degrees. I believe it should have come in at 1.054 but not positive. Maybe the temperature helped with that.
Pitched the Nottingham @ 70 degrees @ 6:30pm. It was bubbling at 4am and rolling when I got home this evening.
Overall it was a great brew session. I had 3 of my cousins and a few friends over to watch and drink and help me eat Jambalaya. In a couple of weeks I will have them back to enjoy Edworts Haus Pale Ale!!!
BTW: For those of you used to Nottingham, I have it fermenting at 70 degrees now. What temperature should I drop it too and when for the best results?