When cutting strips with the Go!, I find that I have to stop once or twice while rolling the die through -- to lift up the mat and straighten the fabric. If I don't do that, I get ripples "ironed" into the strips and/or little jagged cuts here and there in the strips. This is caused by the fabric stretching as it is rolled through the machine. I get this even with fabric that is rolled through on the lengthwise grain (which has less stretch than the crosswise grain).
This has never happened to me using the Go strip dies. I use a ruler and fan fold my fabric before putting on the die, like you do to ruler fold fabric for your shelf. That really makes a difference. I get the V shape in my strips when suing the June Taylor Shape Cut.