GMC Sierra 2500 Hard Tonneau Covers

Easy install by myself in about 30 minutes. Simple to adjust at the end. Factory spray in liner, the clamp is too large to get within a foot of the end of rail near the tailgate, they state within 6" in the instructions, so one side tends to pull up 1/16. Maybe making a set of clamps half the width would help. I love the look but also OCD with the finished look. I noticed on both sides of the rubber top seal that runs the lengths curves in and out up to 7/16 of a inch. As if it is placed by hand at the factory and no guide for the employee to keep it square. Hoping it is not a defect to cause early failure just outside of the 5-year warranty.