console: oplet coloring gradients "too close"

The oplet color generator ends up yielding two light purple-ish colors for two different kinds of (adjacent) oplets and one can't tell them apart. One is a Sink the other is a subtype of Peek - a StreamScope.

I was seeing this in a ParallelBalancedRecipe app of mine. I can provide it if really necessary to repro/improve this.