Not sure if this applies to you but on my F250 Ford brake controller, not only did I need to set the gain, but also an "effort" setting that controls how aggressive the trailer brakes are applied. The default was low and I did not feel the brakes working effectively at that effort setting.
This is something else to check in the owners manual for your brake controller.
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2018 Jayco Eagle HT 265BHS (previous: 2015 23RB Passport Elite, ProPride)
2015 F250 XLT SB Crew, 6.2l gas
PullRite 16K SuperGlide w/SuperRail
Reese 5th Airborne (bagged) Pin Box
RoadMaster Shock Kit
X-Factor Cross Bracing
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