Keep the big tank!! You can use the co2 for a lot of things. Purging the head space of fermenters, carbing kegs that are waiting, blow the dust out of computers.
If you have room for the tank, you won't be sorry. I'd probably keep all 3.
I have 4 BG 14 burners. I just drilled the orifice that came with them to 1/8" and they work perfect. I don't know if there's legalities for using them indoors, but common sense goes a long way.
I made 10 gallons this a couple weeks ago with Marris Otter. My LHBS only had 1 packet of Nottingham, so I used Nottingham in 5 Gals. and So4 in the other. The S04 went from grain to glass in 9 days (Force carb'd keg) and the Nottingham
took 2 weeks to fall clear. I had never used Nottingham...
To cool a sample I use the bottom of a small Stainless cocktail shaker and put it into a measuring cup full of ice and swirl it around.
The stainless transfers the heat like crazy. I can take a sample from boiling to 70 in under a minute.
THIS... I have a 2 gallon space under my false bottom. I like the mash thickness of 1.33 Qts. per Lb. so I fill the MLT just to the false bottom then figure for 1.33 Qts. Per Lb. For an average 11 Gallon batch with 16 Lbs. of grain it ends up being around 1.67 Qts. per Lb. I only make 10...
That's a big hit! My last big beer I only missed OG by 4 points Because I forgot to compensate. I mill at .032 but I condition the malt. Try this and you won't get a stuck mash. (that's a nice FB you have.) Then go down to 1.25 qts. per lb. so you can sparge with more water. Then you can...