Which coil-overs do you have? What settings are you using. You may have them too low and could raise them all up a bit. Or, you can soften the struts up a bit. Are the roads around your area bad? If they are, you may want to keep it soft. Check all the bolts on both the top and bottom. It looks like you checked the top. Check the bottom also. You said also that it makes the noise when you take some hard turns. Is it when you are doing left or right turns? Just wondering if it is only doing it when you are exerting force down onto that side or not.

 

Well, those are good coil-overs, so it isn't shady quality parts. So, it is making the noise when the whole assembly is extending. It almost sounds like something is loose. When they extend like that, anything loose will wiggle around more. This is a stupid thing to say, but did you make sure to have the top of the struts pointing in the right direction? I know on mine, they had to be. Also, if you have changed some of the adjustments like spring rate or height, I would check to make sure that those adjustments are even and tight. There are those two that screw around the strut below the spring opposite to one another and come together tight. If they are not together, then they may move a little. I highly doubt that would be it, though. Do you have a sway bar? If so, did you change the endlinks? If you drive hard and hit bad places on the road, it may be a little hard on the stock endlinks. I'm just throwing out ideas here for you. I have to see things with my own eyes to figure them out.