P. S. why not test the wheel without putting it in the bike? I bet your fingertips can tell much better how accurately the cones are adjusted. I just clamp a stack of washers on each end of the hub and close the skewer on them before checking how freely the axle spins. Then when installing the wheel I readjust the skewer so that the clamping starts in the same place of the lever swing despite the slightly different thicknesses of dropout and washer stack.
Of course that means you are compressing the axle and several washers when you adjust, and then compressing a dropout and axle when you ride, but I think the axle does most of the compressin' and the difference in compressibility of washers vs dropout is irrelevant even if the dropout is aluminum.