These were the last two pieces on this warp, so I decided to try a different weft treadling. I used the TAW undulating pattern from S04E08 of the Jane Stafford online guild (see below)

Pieces 18 (green glow/cedar green, 30cm) & 19 (scuba blue/dazzling blue, 32.5cm) both use:
2 picks of alternating basketweave and hemstitch in black
8 picks of TAW straight draw in black 12341234
2 repeats of the pattern (92 ends per pattern repeat)
8 picks of TAW straight draw in black 43214321
2 picks of alternating basketweave and hemstitch in black