I have a tekonsha 90160 primus iq electronic brake control and have a question. When I press my brake pedal, numbers are displayed and I'm assuming that is the gain being applied to the trailer. I have the gain set to 6.0 as per the instructions and have not changed it. When I press on my brake pedal, the numbers only go up to about 3.0 or so. My question is, instead of doing the whole brake lock up thing to adjust the gain, can I set the controller to like 3.0 and be all set?