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The way I see it you have two options for the side where the middle does not touch the hone.
You can try x stroke 45* heel forward but you have to draw the razor all the way out till the very toe....

So then the razor is not straight?

Where you do not have bevel the steel has a dip , it was ground more than the rest of the blade.
Another possibility, that I did not think of initially, is the blade is not straight and the middle...

Start not tape to fix the spine till the bevel starts to contact the hone. Then you can add tape to finish the job.
I find this the most economical way. If the over grind is not big you can use...