Rule Clarification: Four Degrees of Success and Failure

Open Legend RPG (OLR) defines success as hitting the DC or TN or surpassing it. A success with a twist or a failure with a cost are given at DM discretion. I’d like to define this more.

Percent of TN Result
1-25% Hard failure, double cost
26-50% Failure with cost
51-75% Success with a Twist
76-100% Success