Where is it exactly leaking from? I am on my second set and the easiest way is too shorten the hose then use the olive and sleeve nut in the slave, makesure when you are connecting this to push the hose right into the slave with the olive a couple of mm back on the hose then tighten the sleeve nut into the slave (if you dont the sleeve nut can push the olive off the end and your hose will just pull out the slave cyclinder :$ ) then the easiest way is to bath bleed,,
put everything in the water take the screw out the slave,
disconnect the hose from the lever and suck through the barbed fitting, do this a few times after each time cover the end with your finger to prevent any air getting in,,, pull and release the lever till you see no bubbles coming out and connect the hose back onto lever underwater, screw back in slave underwater, bish bash bosh perfect hs11s.