Do you guys roast the coriander seeds just briefly and lightly before crushing?
I buy mine from Indian spice stores and they are quite "green" (the color is actually very light tan). Not sure if the ones you use have been roasted a bit. I think the McCormick ones are, but very lightly.
I prefer to use fresh orange zest, grated or a very thin slice of peel without the white pith, rather than the dried variety in spice bottles. In Christmas ales I've brewed, I noticed the longer you boil them the more "earthy" they get, losing the fragrant top orange notes. So I layer them with 3 additions 20, 10 and 0 minutes. Next time I will move them all up 10 minutes and replace the 0 minutes with addition at 180-190°F.
Side note.
My wife bought some pink grapefruits and when I zested the peel for use in a raisin bread, instead of lemon which I was out of, I noticed how good that smelled and tasted in the bread and prefer that over the use of lemon. So one of my next beers may likely use some pink grapefruit zest.
I bet you could dry hop (after fermentation is about finished) with zest and spices too, to get the higher, lighter notes.