Horrible Attenuation With WLP007

[Rambleon]

I want to like this yeast. Everything I've read about it makes me want to make it my house strain. My experiences with it have been quite disappointing, though. I've read all about how people are getting near 80% attenuation with it but my last two batches never got above 70%. Actually, 65% and 68% respectively. The batches were in the low 1.060's and I fermented one around 65 and one around 70. I aerated well and made 1.5 liter starters for both. Both mashed at 152 with little to no crystal malts.

Am I missing something here? Should I be adding nutrients or lowering the mash temp even more?

 

[Rambleon]

One of the beers was a Red Chair clone and one was a Marris Otter/Simcoe SMaSH.

 

[Smellyglove]

My last batch was a 007. I did another one a few weeks ago. It took both worts down 79 and 80%. But I mashed 70 min @ 148. The one with a few percent carared ended up at 79%, the one with only maris got 80%. Both fermented @ 66 for three weeks (approx, but no less). My experience was that it took a bit more time to get it down the last 1-2 points. Maybe two days.

Edit: OG was .50