Honing a smiling blade isn't as straightforward as honing a blade with a straight edge. Concentrating on one part may lead to a frown, so try to avoid that. You must also make sure that the King is lapped flat.
I usually use a rolling X stroke, making sure that by lifting/rocking the blade that all parts come into contact with the hone. Watching the way the water behaves helps - it should ride up the blade as you hone, not go underneath it. Also, honing at a more extreme angle than usual helps - by that I mean laying the blade on the hone at a 45 degree angle or so, so that it is well raked back as you hone.
If the blade is passing the marker test, you need to look at with a high-powered loupe - say 20x - 30x - to see that the bevel is set. If it is not then you have more work to do. If it is set, then the blade may have had the temper damaged at some time in the past and it will never take a good edge again.
Finally, make sure that you are not overhoning the edge - if you have formed a fin then it must be removed by backhoning, or preferably by dropping down to a lower grit.
Had any work been performed on the blade when you got it? Was it cleaned-up, polished, have grind marks on it? Was there any discolouration near the middle?
Regards,
Neil