Not to sure exactly. All factors are the same. So it is an assumption that, autos being finicky as they are that maybe the soil blend might be a bit much for her.
I've heard Mephisto puts out some great autos. I'll have to check out Wounded Knees Journal
Oh yeah, of course, I forgot about the autofl. factor .. You could be right - it could be cause autos apparently only need about1/4 -1/3 of the 'food' that photos need. I get what you mean now...