I have found that if I spend a few minutes starching my fabric before I cut it, then the strips have more body and don't seem to wabble. I make my own spray starch, just the old fashioned stuff you dilute with water, so my fabric is a bit stiffer than if I used a commerical spray starch. If I've cut them correctly, on the straight of grain, and sew them with skimpy 1/4 inch seam, press with each round, they work well for me.. For me the starch made the difference, try it, you'll like the way your blocks look!
I would probably carefully starch my strips, even after I've cut them.. Just be careful not to stretch them.