Had the opposite issue on my Flagstaff. Drawer was very difficult to open and left slide failed. Ended up being the brackets supporting the slide were about 3/8" too far apart and were in a colossal bind. When the drawer was opened or closed it eventually pulled the guts out of the left slider. Home Depot had a better pair of slides for $12 and I riveted them in place of the originals. Then I removed one side of the slide mounting brackets and slotted the mounting holes with my death wheel. Now it opens and closes smooth as silk and the slide latches it closed firmly.
Also, the OEM rivets used a shank that was too long and installed backwards in my opinion. The rivets were installed from the inside of the drawer with the shank of the rivet through the slider. This allowed the extended shank of the rivet to interfere with the movement of the slider as well. When I reinstalled my new set I riveted the new ones from the slider side and used rivet washers on the inside of the drawer to increase the purchase of the rivet. No clearance issues.
Current vehicle list: 16 Flagstaff 832IKBS, 14 RAM 1500 4x4 Hemi 3.92 Bilsteins!, 04 Dodge Ram SRT-10 40,000 miles, 03 Dodge Stratus Coupe R/T 222,000 miles, 97 F150 4x4 5.4L 235,000 miles, 80 Firebird Esprit (drag only), 78 Harley Davidson FX 79,000 miles dad bought new, 71 El Camino ZZ3 TH400 12-Bolt, 37 Ford 3 window 502 Chevy dad built