Here's the issue... my 2015 2500's trailer brake controller has the option for "light electric, heavy electric, electric or hydraulic, etc." In "Light Electric" mode in able to adjust the trailer brakes from 0-10, up and down with the "- and +" buttons just fine. However, in "Heavy Electric" I can only reduce the gain, not increase it. Am I missing somethin or is there an issue? Help is appreciated!