That's a shame. My first stiltonesque went in the bin as well (also ammoniated, but I had plenty of blue mould development). Hmmm, in the semi-lactic boards there's a thread on a semi-lactic blue I made a few years ago. It turned out very nice, and it's a small, 2 litre make. Might be worth trying something like that for a bit until you get the blue mould working for you. Everything else about the make looks fine, just your PR development never took off. It seems when you don't want blue, it's everywhere, but just try and make it grow when you want, and it's nowhere to be seen.
You'll get it though.