Same here, not one datamined wake echo out of about 50 scans (with like 80% Atypical Disrupted Wake Echoes). All at one station, though. Sure that those scans are place-independent?
anyway, I will park at a highly popular station and just scan away.
UPDATE: Got some 9 scans from nowhere (only one scan I noticed), did the low-upgrade-marathon to get to Grade 5 and am nice and cosily equipped with Grade 5 FSD range upgrades now. Thanks all for the advice!