Just a simple question. How are your angles. Nothing catches an edge on whiskers like too high an angle. Before going to the balsa or any other sharpening process I'd suggest eliminating all potential prep, lather & technique contributors. If this doesn't solve the problem try the balsa. If that doesn't do it then send it out to be honed again. This time when it comes back don't strop it before you use it. That way you'll have a starting point to determine future sharpening needs.