Damn dude, I just birthed 10 cakes yesterday morning, about to soak my perlite and get them in the SGFC in about 2 hrs. Did you follow the tec to a T? I find it best to grind your own rice, try and buy Organic Rice and grind it up in a coffee grinder, leave it a little chunky. I find the mycelium likes it a lil chunky. Not tooo chunky tho. Use FINE GRADE vermiculite for both your dry barrier layer and to mix in the BRF. Here are some videos if you need help. Follow them to a T! Roger Rabbit is a mycology GOD! Seriously, he is just godly when it comes to mycology, listen to him and you'll be growing mushrooms in NO TIME!
http://www.mushroomvideos.com/BRF-Pf-Tek remember, follow it to a T, do everything he says and does, do it exactly and you should have INSANE results! I run 20 cakes at a time and Im honestly backed up on mushrooms now lol. I dunno what the heck to do with them all bc I dont sell and I dont give them away and I only eat them once every 2 or so weeks lol. They also say to colonize at room temp, 70 is PERFECT, anything hot will help contams grow. You want your mycelium to be able to outgrow any potential contams. Once its fully colonized its VERY hardy, very resilient to contams..It can pretty much fight them off, depending on circumstances of course. GOOD LUCK BROTHER!!!!