Well what do you have access to to do a re-profile job?

Good results have come about by guys using Automotive Wet and Dry carbon sanding paper and home made mouse boards stuck to a block of wood...the mouse board gives the paper that flex to get a curved convex edge...and using a marker pen you can colour the edge and see where you are removing metal...you want to be taking it off the sides of the edge first and then re-profiling down to the cutting edge...don't worry about angles if free handling the knife...just go off results from using your finger or forefinger to test the edge...not down the edge...just across it...you won't be far off and the "long way" like this gives you "muscle memory" for how to hold the knife for consistancy.

Check out U tube for some good tips....film movement shots can speak volumes...

Editted - Just read MM's response...guess we are both saying the same thing.