It definitely wasn't my best shot for sure, but I appreciate you bumping the thread again to help highlight the issue! Despite it being a rough shot, inside of 5nm, at .67 mach, especially at that altitude, it shouldn't have had much trouble reaching the target. In fact, you can see the TTG counts down to zero where it says "LOST." I'm currently downloading the tacview (as you suggested) to try and see what the missile did. My guess is it did the ol "turn away from the target on intercept" that many have seen the 120B do lately. Further, I've noticed that the missile tends to bleed speed like it has a drag chute once the rocket motor extinguishes. My guess is the CFD data hasn't been addressed in the -B like it was in the -C and we're trying to use an extremely draggy missile.
Thanks for the feedback Max! Your expertise is always appreciated!