What would you do to make this ladder more usable? It's for a flock of fifteen 5-week and 6-week old standards and bantams. They have no problem getting up and using the swing (pictured to the left of the ladder) but they don't like seem to like the ladder rungs. The ladder has only been up for 4 days and the rungs are alternating 1.5-inch and 2-inch PVC pipe spaced about 8 inches apart. The swing, made of a very wide driftwood log was only up for a day or two before they were up and using it. The PVC seems too slippery. I've since put the ladder nearly flat on the ground so they can get used to climbing on it with no incline but still, not much action. (Their roosting poles in the coop, which they haven't started using yet, are 2x4's so not all their roosting spots are curved).