I've actually seen people go through your experience and the opposite as well - ie: they did well on the NBME and the final result wasn't up to what they were expecting. My suggestion, keep calm and do another NBME yet again. It's not the ideal comparison to the step1 but its the best we have so if you stay calm, relax though the questions and manage to keep your focus completely through the nd of the fourth block you'll do great.Maybe I was too nervous when I was taking the nbme tests, as long I knew that they are very crucial for my final performance...
I'll try my best for 1 month more and I will take the test this time, no matter what!
I'll let you know for my progress
Thank u again!!