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Hippie3- Yeah, I noticed that they were rather slow growing, but I did another experiment to try to induce pinning. I kept the humidity rather low in the terrarium(I use perlite), when the cake quit flushing, I just misted the dripshield real good and the next day the pins came up.

As for the contaminants- I cut two cakes in half to see if the contamination was inside, but the insides were clean.

In the wild, mushrooms have to fend for themselves and develop stronger means to fend off infection. When they are 'tamed', they don't really have much agrivation from competition and their population looses their vigor in that area -- it's microevolution per Hardy-Weinberger theorem.
On the other hand, I think, when mushrooms are domesticated the grower might choose the fastest growing fruit of the fastest growing mycelium to take a print from...not the most stress resistant mushroom. It's all husbandry, and if a stress resistant strain was developed a newbie could grow shrooms with less risk of contamination even though it might take more time to grow a crop.

It's just a thought. I know when I grew my first batch I couldn't wait long enough; so I just picked a lot of little fruits of my PFs...