Hi , I use the same method as yourself,disc lock on the front wheel and large Oxford chain through the frame just below the airbox and then I pass the chain through the back wheel.Thats it for when I'm at work.At home , the same method but It gets locked to the wall , one security light above,one on entrance to garden. But I have always gone by the fact of whatever your going to do if someone wants too nick something that bad they will,whatever we use. I have heard of bikes just being picked up with a lorry grab! It's a shocking world we live in!..