I made my starter last night for my brew session tomorrow. I used 2 cups waster with 1 cup DME. My starter is now at full krausen! I've done this before and it's usually taken at least a day to get to full krausen. I'm using WLP001. My question is should I put this in the fridge to slow down the yeast attenuation or just let it go? I plan on tossing it in around 3 or 4 tomorrow afternoon.
I'd let it keep on going. You don't want to slow it down. Are you using a stir plate? If you are, I usually turn off the plate when I start to brew, so that by the time I'm ready to pitch, I can decant and pour the yeast into the carboy.