I would have to disagree with the OP. Personally I have all crafts at 50 and have had just as many things with say 10-20% chance hq as things with 90-100% chance nq. I think you have just been getting bad luck, the thing about RNG is that it's exactly that, random. Unless you have a sample of several thousand results and see a clear distinctive pattern I really don't think you can justify that it's not working. Just because you get bad luck multiple times in one session doesn't make it anything more than bad luck.