When I came back to it this morning I had decided to leave out the corresponding beads on charts 2 and 3, just to make everything match. I switched to skein 3 on row 27 ( row 3 of chart 2). I used up all of skein 4, and didn't do any transition rows. I don't do transition rows any more, and with this yarn it really wouldn't be necessary even if I did, the color change is wonderfully subtle.
Pattern: Koi Rama by Kitman Figueroa
Yarn: The Unique Sheep Tinsel Toes in Pisces
Needles: US 8 (5.0 mm), US 6 (4.0 mm), US 4 (3.5 mm)