I have never used a rr under a float. Have fished jigs under one and this is a real good method when the fish are shallow. You can fish one deep but you will either need a slip float or a long rod so you can cast a locked down float. Either way I want the jig to move, so it is more of a casting and reeling in slowly. Jig it back. Stop at let it sit for 10 seconds and jig it back some more. Good Luck.