Aileen, based on the photo you posted on page 2, IMHO, you can continue to adhere to your house rule of remove no handquilting. The slightly narrower cable near the corner does not show on the front because the busyness of the fabric camoflauges it quite well. If you have not yet done the other corners, I agree with Holice, make the same slightly smaller cable in the other corners as well and it miraculously goes from "mistake" to intended design choice!
. This is a gift, not a show quilt and even if it were to be shown it is still quite worthy of display. Beautiful quilt and absolutely gorgeous handquilting. I'm a slow handquilter too. One of the many reasons I invested in a LA.