A different way to do those wave beads is to make a disc with a twistie (sometimes, some glass, like the 104 silver glass and especially boro do multicolors already) and zig zag a clear stringer around, almost mandrel to mandrel, then melt it in.
These were done with boro and that method. I have some pics with 104 using that method as well but they're in an old file someplace.
Slightly pushing the zig-zag of clear back and forth or just laying it down will give slightly different results.
You can also do a variation of that for tab beads where you want the waves the opposite direction. I would lay down a base, a tight twistie on top, melt it in and pull a loose spiral with clear stringer. Melt in, pre-press, then encase.
Really, so many ways to do them.