I've used the same technique on my props. Every prop gets balanced after the hole is drilled or reamed. I haven't had any issues with
structural failures and the vibration doesn't seam to bad considering it is a 1 cylinder engine running.

I had a 2 1/4inTru-turn spinner on my first Pulse and it worked out good. My second Pulse got a Great Planes 2 1/4in spinner and it worked out
good also. The stock spinners never even made it onto the plane.