How do I fix pickles that are too sour?
If you are going to do anything, do it when you are ready to put the pickles in the fridge again, not when canning - acid keeps the canned pickles safe. 

So - leave them really sour as canned. When ready to eat a jar, open, dump the brine, add water (whether or not you salt it is up to you and the salt level in the pickles - I'd try plain water) - put it in the fridge. You might want to let that soak for a day or two, and you might want to dump it again and replace it again, depending on how things taste at that point.