Brake controller problems

I'm very surprised that after two hours of travel, a difference in stopping distance with the trailer on was not noticed. I too was new to the new brake controller and the installer advised me to start out around 45 and go up or down with the way the trailer reacted. After a few stops at normal stop signs I soon realized the trailer was stopping my truck fairly quickly with little pressure on the pedal. After a few more stops I finally settled with the setting of 23 on my 20 year old rig. I know controllers are different makes and all but find that if mine was set to 85 it would be so obvious to me. I think it would be safe to turn it down to something under 30 and leave extra stopping distance in case of the brakes pad have worn more than should. I would really make the shop put new shoes once I returned home. I hope everything works out for you and you enjoy your time and nothing else major go wrong on the trip home. The only recourse the shop has in denying warranty is operator error.