Also swept yesterday to SE100KMM from 75KMM

Trying to re-book my aeroplan xmas flights since they are now half the miles with the new status(75,000 for 3, instead of 150,000 as booked), but it is proving impossible since we are inside 21 days, meaning to change 3 tickets would be $450.
I was specifically waiting to see if I got swept before booking, but eventually had to pull the trigger with 75K status to secure seats.
I'm sure its no coincidence that the sweep comes withing 21 days of the busy Christmas reward flight period.