According to what I was taught some time ago when Packet Clusters were the rage was DX 21.295 DXDX (QSX 305)...or similar. Makes sense and works. I know I have heard many individuals complaining and so forth over the DX when it is spotted incorrectly....
Maybe some people are incorrectly spotting on purpose because of the prevalence of unthinking operators who click on a spot, tuning their radio automatically to frequency, and start tuning their amp or transmitting without figuring out the pile
I would much rather have them transmitting blindly up in the pile somewhere than right on the DX frequency.
Probably not really ... but I am never going to complain if people are "spotting wrong" in a way that makes it a little harder for people to find DX without engaging brain.