That is WAY too high for the brakes, There are many videos on YouTube for adjusting them. Basically on a flat surface drive 20mph, them squeeze the trailer brake controller, this should bring you to a smooth stop, brakes lock up on the trailer reduce the setting, no stop increase.
I had mine way to high and it sounds like what you are experiencing.
Good luck
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Northern Illinois
2018 Ford F350 6.7l diesel dually.
2019 3790RD with Legacy package.
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