You're just taking a chance when you use a deep cut-in on a bendy handle bow. Not to say it won't work, just a higher probability that you'll see a crack develop in the fade that will travel into the limb.
For a bendy handle bow, you can either (1)not change the shape at all from the limbs, or (2) you can shape it modestly (like narrowing from 1.5" to 1.25") and over a couple inches on either side. Gradual narrowing, gradual thickening. This way you don't have a lot of fibers in one place that are cut off from the rest of the limb. Sometimes you leave this handle a bit stiffer too, a semi-bendy handle.