Hi Rob,
I'm a Ford guy this time around, so I'm not on top of GM specific tech. But based on fifty+ years of towing with various brake controllers, my first suggestion would be to set your gain for a little less than half of max setting. Most trailers, in my experience, will be manageable, at this setting until you can fine tune her on the "flat and level". If you find you need a little more brake control in transit to that place, dial her up a notch.
I think, based on my experience, this is a safe place to start. If you feel like you're in trouble, you can always hit the "Dolly Bar" and lock her up, and then add some gain to your adjustment. You'll dial her in pretty quick, especially on a gravel road with a little practice. Just bear in mind that your hauling a (probably) empty trailer. You may need to adjust your settings after loading up for a trip. Your Trailer Weight will probably go up.
Good Luck,
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Pull Toy
Steve & Jan, Ava & Emma (Mini Schnauzers):
2016 F350 Lariat 4X4 Powerstroke CC/SB "PULLTOY V"
2013 Alpine 3535RE "MAGIC CARPET IV"
Proud Navy Vet!
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