There are a few adjustments you can make on the Sensori Venture barefoot style sandals to get a perfect fit.
Start with this video:
You can adjust the tension of the front section (above your foot) by pulling lace through the ankle holes (pull more toward the heel to make things tighter, pull more toward the toes to make things looser).
You can adjust the tension of the heel section by moving the OUTERMOST lace through the tensioner — pull more “through” the tensioner to make things tighter, and pull more “back” to make things looser.
If you tighten your heel lacing and end up with “too much lace”, you can move the tensioner forward by moving BOTH laces through it.