How does the "Uncle Mikes" conceal for you? If you wear tighter jeans anything will be hard to hide. In jeans (relaxed fit) I use a UM size 1 for my P3AT, in dockers or cargo pants I use leather. Look into kydex, thin and light I know
Stockdesigns
Makes a popular one for the KT line, maybe he'll make them for LCP.
One more option is a P3AT clip, looks like a knife clip. It most likely work on the Ruger.
Good luck and don't quit just yet.