I had the same problem with a Bargello I just finished....came out of square with all the dense quilting and once I'd put the binding on, to me it was screamingly obvious. I winced and winced at it for days and it didn't improve with the "finished and washed" wash. I made the quilt for the bed in our new caravan (do you call them trailers over there?) and now that it's been on the bed and travelled with us for a few trips I just love it regardless and don't notice its wobbliness anymore.