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Here is my Marshes and Shepherd 'An Excellent Razor'.
I've been practicing on several other smiling Sheffields in preperation for it.
It is not warped, but is a very complex grind.
Smiling spine...

I defer to the expert, but personally have found the 'rolling' stroke very useful for complex blade shapes and slight warps on happy Sheffields.
Then there is the 'rolling' strop stroke, which also...

Have you read the wiki on the 'rolling x stroke?'

Rolling X stroke - Straight Razor Place Wiki

I'm learning this too, and have found the rolling stroke usefull.