To clarify - the min/max override feature was intended only for overriding HPT-set limits in cases where the ECM actually supports higher values.
So if the ECM software was only meant to work with a value of 1.0, even though the data structure may support a value of 2, the ECM may ignore anything above 2.
In other words, I would not adjust the values unless you're absolutely certain that the software supports these (higher or lower) values.