There are restrictions that apply to this technique. Floats work best in an uneven number and the shouldn't be longer than over 5 wefts. They also look best when started in the top shed. Single dots of pattern colour hide in the background when they are lifted from the lower shed, so there are advisable sequences within patterning.
Reading your text again made me notice that you suppress the background colour between pattern threads. Ruth showed Tracy and me the technique without supressing the background colour. It does't show in the end result on top, but controls the floats on the back a bit and is a lot easier to work with a more stable fabric as a result.
You don't make it easy for yourself with this handheld warp set-up too.
Ah, well, but the "restrictions" you mention aren't really hard ones, are they? They are more like tweaks to make the patterns look better or have less floats, but not things that will work as opposed to things that won't work at all.
I think Ruth's method with the not-suppressed background needs the additional pattern thread holes, otherwise you will have background spots between your pattern threads. Or did you work that technique with the setup that Ronja provided?