So there are a couple of possible issues here, though just to answer your question about larger brakes, you do need to stick with 10 inch brakes as 12 inch brakes will be too large. Based on my research, your Forest River Flagstaff E-Pro E20BHS.
The first thing it may be is just that you haven't traveled far enough yet with your trailer. Electric brakes need about a 200 mile breaking in period to allow the brake shoes and brake magnets to bed into your drum. During those 200 miles you... view full answer...
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