Went back and ground down the seems around the rear cap about 3"-4" each side and will add a piece of 1708 then a layer of matt over that and them fair back in. Hopefully this will make it much stronger. Thanks to all who helped with the seem grind back info...
Here is part of it that was ground back ready for the wider cloth. You can see the 2" wide area in white where I seemed it together the first time and where I ground it down to make the next layer much wider:
