French Cleat Hangs A 65 Pound Mirror On Drywall 

Cheers back atcha!

I would go to a local hardware store and buy 'fender washers'. Fender washers have a very large exterior diameter when compared to the fastener hole in the washer. I would try to put some kind of straight edge on the wall and shim the cleat with fender washers to match the straight edge. I hope this helps you out. Just for the record, I am not bonded, licensed or insured 😆

Used some shims and got it fixed up! Thanks

I purchased it from Amazon. Go to Amazon and search french cleat and there are a ton to choose from. Thanks for watching!