1994 Honda Accord False Positive on the CV Joints

My accord has been making a knocking sound while turning sharp left for a few months now. I had had my CV joints and axles replaced about 20,000 miles ago due to torn boots and lost grease (i figured better safe in a new axle on both sides). The current knocking, I thought, was the remanufactured axles failing early. I took it to a shop which I trust, asking them to pin down the knocking sound and to replace the cv joints with new parts if necessary. They also thought it was a textbook bad cv joint during a test drive. Upon replacing the joint and axle, however, the noise only got louder. They then thought it might be a worn wheel bearing, as tightening the bearings down made the noise quieter. This, however, only reduced the noise by about 80%. They are now completely stumped, and after using chassis-ears, have determined that the noise seems to be coming from the axle or strut, but can not pin it down. They have been very honest, and are not charging for labor or parts that did not solve the problem, but I need some ideas as to what could be going on. Any ideas?