I agree, I started with a 12/8 8/10 and 5/8 and could do quite a bit but added many more since then. Mine have tended to multiply in terms of different sizes of the same sweep rather than different sweeps though. I have 5s and 8s in various sizes from 3-20.
I have done more figure carving than flat work recently but your video I think has me inspired to do some relief carving this week. I can also see a 3 in maybe around 14 coming home with me from woodcraft for background work.