It does look better in reference to the top of transom, but as Pat Goff pointed out "I have seen some awful transom angles before and you might have one, but you have to verify from the bottom not the top."
Your motor should be plum to the centerline of your hull's keel line. Did your friend find the holes to be 1/4" off after the JP was verified as squared?
BTW, 3/4" would be the distance from center to center of holes on your motor mount, and try NOT TO OVER TRIM your motor once you are on plane, which will aggravate your chine walk. Once you are on plane, start trimming up in very small tap increments until you feel the oscillations, now tap down 1 or 2, if it stopped, stay there and get some seat time.
Here is a link that may help you:
https://www.screamandfly.com/content...-How-To-Fix-It