I recently bought some 1 inch heavy polypro straps with D rings from strapworks,(nice stuff) I tried making the ring setup. Cord from the hammock to a prussic knot on the two rings. It seems very solid. But when I attached it to the tree I get some slippage. I was slowly lowered to ground level. It would have made for a funny video. Should I have gotten the nylon strapping instead, or a wider 1.5" strap? It seems like I have the makings of a simple system once I get the bugs out. Do the cam buckles lock up better?