OK, so I have the horizontal rows sewn and now trying to match the verticals on the double Irish chain. The thing is, it is a queen size (huge) and after trying to pin the darn thing and sew across it never fails that at least one block seam is beyond what I deem acceptable. The only thing I can think to do is hand stitch each intersection before sewing on the machine to ensure they align. I know a lot of imperfections will disappear once I quilt on the diagonal through the chain, but I’d like to get it as close as possible, do you have any suggestions that may help me achieve this?