The thinner the bias strips, the easier it is to shape them into curves. A 1/4-inch wide stem can be shaped into tighter curves than a 1/2-inch wide stem.
I like the Clover tool also for bias strips.
When you sew down a curving stem, sew the inside part of the stem first. Because it is cut on the bias, the outside will stretch to fit the curve. If you sew the outside curve first, you can end up with little ripples on the inside curve. In other words, you can make a bias strip stretch into position but you can't make it shrink!