I had same issues!! My friends would laugh because no matter what I did the cuttings were off! Like you was ready to quit!! I found June Taylor's cutting system, it has measurement and slots to put your rotary cutter. I bought the biggest size she has one in 1 and 1/2 " slots and I believe 1/4", 7/8" ones which I rarely use. Most of the times my measurements are right on. My quilts are by no means perfect but much much better! Good luck