Brewed a 3 gallon batch of this 1/16/17 with an OG of 1.124. Kegged it yesterday and the FG was 1.047. Was really surprised that it seemed pretty balanced and only a little too sweet considering the high FG. I'm not sure I've ever drank such a thick (viscous) beer before.
Used S-04 yeast with a three stage starter (and overpitched if anything) and am now reading that S-04 may have an alcohol tolerance around 10% which is right around where I ended up (10.35%)? For some reason I used the shake method and didn't use oxygen so that might have also played into the high FG. Will definitely brew it again though!
I've used this method for getting above 10%. After 12hrs in fermenter reoxygenate by going back and forth between fermentors then divide the wort in half between 2 fermentors. Then recombine after completion. I've gotten 13% doing this. Oxygenating the wort is not a concern since the yeast will eat it up.
Others have used an aquarium pump with air.