I've been having a similar adventure working up something humongous in the DFH120 realm. Goal was to break 22% ABV, standard, without ending up with a hot fusel mess. Full temp control throughout was needed to keep this thing from turning into something nasty.
Started with an over-pitch of hydrated US-05 into 5.25 gallons of 1.09 wort, let it get down to .015 after a few days, then put it on a feeding schedule of a pound of corn sugar every three days. The US-05 kept taking it under 10 points - and once under 4 points when I lost track and let it run an extra week. I was concerned this might lead to something overly thin, so I did something nutty (and likely a bit risky, infection-wise), and pulled two quarts of beer to a pot, warmed up three pounds of light DME to 130°F, and poured it all in the carboy. This final addition brought the "adjusted OG" up over 1.180.
But, predictably, I guess, this totally stuck. The yeast would have no part of this addition - they had clearly developed a taste for corn. I let it sit for a month and it was still sitting at the same 1.022 the last addition brought it up to. Which would be ok for some I reckon given the style, but I wanted to get back down in the teens.
Kudos to the US-05 for hanging in so long - the ABV had to be around 18% by that point, but it was time for the coup de grace: I plated up a vial of WLP099 to four angry liters, decanted off the spent wort and pitched the yeast. Gave it a month sitting quietly, then Sunday the hydro test showed it back down at 1.010! 22.31% ABV! And it's smooooooth. Even the wife liked it! I'm gonna dry hop the heck out of it, keg and carbonate it, then bottle it. It'll keep me warm this winter
Anyway...A big pitch of WLP099 could do the trick...