I brewed a roggenbier and pitched WLP 380 (1.059 OG, 154F mash). Fermented at 62F and everything went great...except that it stalled out at 1.020 instead of 1.014 like predicted. I raised the temp and tried to rouse the yeast and got nothing. Can I pitch US-05 into the beer to try to drop a few more points? Beer tastes ok, if you like sweet beer, but I don't. Help!