Look into Brewhemoths. They are nice, 22 gallon size, I'm currently fermenting two 10 gallon batches in them, I own two. They are pressurizable to over 100 psi, you can buy a chiller attachment. A good deal.
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If you ended up with 6.5 gal of 1.060 wort, that's about 60% efficiency by my math. What would your typical efficiency be for a smaller beer? Lauter efficiency for that mash (it sounds like you were batch sparging) would be ~80%, so your conversion efficiency is in the 75% range.
Have you calibrated your thermometer(s) and hydrometer(s)? Did you check mash pH? Generally, for conversion efficiency to suffer, either the temperature or the pH has to be out of range.
No matter what, I'm thinking you may have some volume measurement error, since 10 gal - 18 lb * 0.12 gal/lb = 7.84 gal. Unless you're mechanically squeezing the mash dry, you shouldn't have been able to get 8+ gal out of it.
Did you add yeast at bottling? My last barley wine I did and it carbed up nicely in two weeks. Also, right after I started brewing I brewed a Ruination clone...well I underpitched it, it still tasted great. But I didn't know to add yeast at bottling and they were all flat, everyone of them. But I still drank em!
Now I keg everything but one barleywine a year. Problem solved.
I think when he asked if he should "pitch it" he meant "throw it away" not pitch pitch it.I agree. Pitch it, not pitch it!
I think he should save it, too.