I have a question: few people talk about endospores, and maybe I missed something. The sterilization process may not destroy them so why not add the water (hot) to the grain in the ratios you note then let sit for 4 hours and then sterilize. Would it make any difference???
You could do that or even put everything in your PC, warm it up and let it sit or even a gentle boil before adding the weight. I don't think it is necessary though,. Here are some bags I PCed back at the beginning of Dec, never innoculated just sealed. They seem to be doing well, no contamination, so far. The cracked corn in the WBS is looking a bit squishy though.