I don't think any Sage utility fixes zero quantity cost tiers with value.  This is what we do:

Adjust +1 at no cost, post. 

Adjust -1 at the total cost for the tier, post.  Done.

After doing your suggestion this was the outcome..

When doing the adjustments, you have to choose the bad tier for the +1 and for the -1.  That looks like you created your own tier during the adjustments.

When doing the adjustments, you have to choose the bad tier for the +1 and for the -1.  That looks like you created your own tier during the adjustments.