No, you're right. It's the same colour I'm using for the mountains, so I didn't think much past that, but the thicker lines of the mountains keeps it the deeper colour on that layer. The trees are a little more transparent, so the red is showing more. It will be adjusted for the final version, thanks!
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I just set the opacity from 75% back to 100% and it does look better. Incidentally, the base colour I'm using for everything is 530200 set to multiply. I'm not actually using any layer styles on the inked layers btw. What I did was copy each layer, then ran a Jiggle filter across (I could screenshot the settings if anyone really wants it) and followed by a gaussian blur at 1.0. That layer goes overtop of the original layer, also set to multiply. Looks like if I set the original layer to 75% opacity, it keeps some of the reddish, at 100% it's completely dried, as it were