If the wool is flabby, it's more difficult, true. That could easily be part of the problem!

No matter how many thicknesses you baste through, the real issue is having a bunch of basted pleats in the way when you're trying to sew one. If you're going to baste, baste and stitch one at at time, and it will be easier. In the long run, though, I think you'll find it easier and more accurate to pin. But, it's up to you!!

Barb