I had the same issue on my bont riots. The sharp spot was on the lateral edge just behind the little toe.

Unfortunately, it's not part of the easily moldable areas.

I used a heat gun to pinpoint the area, heating it well beyond 160F, then pushed from the inside with a screwdriver handle or other blunt object.

If you smell burning, you are overdoing it.

It took a few repeated treatments.

Also, I could still feel a hard area slightly, so after it cooled, I put a strip of 4mm adhesive backed foam on it as well.

Now the shoes are amazing.