I took away from the warp every other thread which was blue. Much better, you can see the bright colours more clearly than before.
Here is the resulting språng interlacing: a very loud, argyle-like result. Quite stunning, really.
Got the row compaction wrong on the back half of the fabric for the first six inches so the fabric looks too loose there, but I am doing better now. The photo shows the first several inches on the front. Since then, I have gotten about a third of this peacock scarf done.