I'm using coilovers with the whiteline adjustable endlinks and OEM sway bars and I also had clunks in my front end over certain slightly uneven surfaces. I spent some time looking at it and found the bolts that keep the end links at length had backed off a bit and let the bushings move back and forth and they would knock against the mounting points on the strut when loading/unloading on uneven surfaces. Pic attached to show what I mean. Red circles are the bolts that had loosened and the purple arrows indicate the parts that were moving causing the clunking noises:
Used the opportunity to adjust my swaybar preload which I had never bothered to do before and then tightened the bolts back down and everything was nice and quiet again. Car also handles much better than it did before.