Ye, thats the right one. You are just unlucky. The chance to get 11+ fcr is 8% for one crafted amulet. Just try some more
The chance to get 0 amulets with more than 10 fcr with the recipe after 150 trys is 0.000369976% that is how unlucky you are. This is impressive as this is in the same ballpark as finding the eth rep fools ba that everyone likes