So I brewed yesterday and pulled it off in the end fairly well. I did my initial infusion with .9 qts/lb of grain (4.75 gal) for the 30 min rest and added just shy of 2.5 gallons of boiling water to raise my temp, but it only got to 142 so I added another gallon of boiling water and got it up to 146 which I figured was close enough to 148 so I let it ride. I had put a total of 8.25 gallons of water in so I was expecting around 5ish gallons from the first runnings and heated up 2.75 gal for my sparge. . .
First runnings stopped just over 3 gallons. . .wtf?
Ok, I'll add another gallon or so to the tun after I've added my sparge water and sparge more, problem solved. . .
Second runnings got to 7 no problem. . .and kept coming. . .and coming . . .I have a 10 gallon kettle, I stopped the runoff at 9 gallons.
Apparently I had a stuck mash that I wasn't aware of and when I stirred it up for the batch sparge, I was able to loosen it up enough that it all came out. So now with more than 9 gallons total, I boiled down to 7 gallons and then started my 90 min boil. As I boiled some off, I ran more out of the tun just to make sure I got all the sparge water out.
Overall, this turned into an 8 hour brewday, but the good news is the target OG was 1.109 and I got 1.10 so I am very happy with those results. I pitched 2 packs of US-05 and now I get to wait for 9 months. Lesson learned, when you are 2 gallons short of your target for your first runnings, you probably have an issue that needs to be addressed.