Welcome and good luck. Sometimes if I have a block or several that are just a little off I try them in different positions. Like if I tried it in the upper left and it didn't match but for some reason if I put it in the bottom right it matches. It looks like some of those blocks can be interchangeable so I might try something like that before I start ripping (frogging) out stitches.
A quarter inch foot is a great item to have for in the future. It is a foot the has a guide built on it that you put your fabrics up to as you sew to help keep it in line. Even if your needle doesn't adjust side to side that will help make your seams more consistent.