curious how you mounted with the screws. did you just go right into the bumper and the fender? when i did mine i used J clips so i can take them on and off and can secure them pretty tight with the stainless bolts. btw im sure you have truck supply places near you so go and get some 24x24 truck flaps. i bought a pair and was plenty for all four corners. i have had mine on for 2 years know and they still look like the day i put them on. oh and they only cost me $12 for the pair. screw $100+ for ones which eventually loose shape and curl back.
here is my setup (btw this is when i was on stock suspension now im on sprtlines and dragging the flaps every now and then)