After 14 days in the fermenter I'm stuck at 1.029. It dropped 1 pin in 1 week. I've been able to hold it stable at 80F and 7 days ago I even tried to stir up the yeast cake carefuly. Not sure what to do now. Should I try adding a pack of dry yeast? Getting a bit anxious
This recipe has been notorious for slow fermentation and I'm not convinced it's supposed to be fast fermentation given the OG and the phenols in such a complex brew. The best advice I've gotten so far was from Jamil. He and Chris White (White Labs, same guy), wrote the book on beer fermentation (literally). Since this is a brew well worth saving and the added time will actually enhance the quality of the finished product don't sweat it. You're still ok. If you need to re-pitch, (which is fine), then here's the advice that worked for me on one stubborn batch. Jamil's email went something like this:
1. Re-culture a clean stir-plate starter of Westmalle WLP 530...(Jamil suggested using a lager and it does make sense, however, I was concerned about the lager flavor creeping in). You make the call on cell count but I would pitch a MrMalty calc new starter entirely. Won't hurt a thing. (I use only top-cropped yeast and baby it with O2 and nutrients). This type clone requires that you have a stir-plate or you'll go broke buying yeast.
2. Just at high krausen, (12-18 hrs), give the new starter a shot of O2 and for Pete's sake do it over the fermenter because it's be spewing yeast everywhere, then let the yeast absorb the O2 for 30-45 minutes.
3. Pitch the whole thing and agitate it into your fermenter, (yes, it will reduce your final ABV a little).
4. (My advice) Still keep the brew at 81-82F and agitate it to keep the yeast in suspension. In about 2 weeks you'll hit your gravity and it'll be amazing. (You'll wonder how it survived and did so well).
Westmalle is a tough yeast. It will live for some time in 14-15% ABV. Underpitching just slows things down a bit and this might be a good thing in the end.
There are probably 3 reasons the gravity is getting stuck for some of us: Not using Servomyces, under-pitching yeast, and under-oxygenation. For this gravity you need pure O2 at about 10 ppm and this means a pure 02 shot for about 80-90 seconds at least. Shaking or aquarium stones won't 'ever' get it there.
My troublesome Westy clone fermentation took just over 5 weeks to come down to 1.012 from 1.092. The flavors were worth the sleepless nights
P.S. In order to avoid any flavor conflicts on another pitch I always use harvested wort from a previous batch of the same recipe.