Is it possible to check the wires on the compressor to see if you're getting voltage there? If you have a map of which fuse is for each function that would be very helpful. After identifying the fuse that activates the clutch check it with a continuity meter in addition to visual inspection. Clean the contacts on the fuse & put it back in & pull it out a couple of times to help clean the female member. The timing of loss of your a/c and changing some things does sound it's possible you pulled a connection loose, or partly loose so that it appears all is well.