Is it more of a popping noise? Does it occur going over any bumps or just when turning the wheel?
I had a very similar noise I chased for months with mine. It was only at low speed, on the right side, usually turning left to lock like when doing a U turn or pulling into a parking space. When you hear a popping from the top of the strut its pretty easy to assume the mount but mine checked out, I replaced it anyway but no luck. With our strut set up, the mount is flat and the spring can rest anywhere on the insulator so there really isn't a way for it to not be seated properly. I took the right side apart several times, it would go away and they slowly come back. I stumbled on a TSB for several other ford models for low speed suspension noises, especially parking maneuvers. It recommended greasing the jounce bumper (bump stop) and I tried it. I haven't heard the noise since.
You can do it without disassembling the strut. Jack that corner up, reach up through the spring into the dust boot, pull the bump stop down towards the bottom of the piston. Apply some silicone brake grease to the very top of the strut rod where the bump stop sits (I put a little extra on the top of the bump stop itself) and slide the bump stop back up into place.