I'm with 10pups on this! Having a flat stropping surface takes some variables out of the equation: sag in the strop, twisting, missing part of the blade, etc. Also try using a slight X-stroke which will help make sure you keep the blade flat and strop the whole edge.

Quote Originally Posted by 10Pups View Post
If your using a hanging strop....lay it down on a table and try stropping that way. You may be stropping with too much slack or to much pressure. This method will eliminate both of those mistakes. And strop till you drop. In other words double, your laps. I won't go into testing for sharpness because it probably won't do you any good at this point but if you follow all the advice above and it doesn't work , I suggest you find a mentor that can touch up your razor and help your stropping technique.