Targeting those 1k below will not fix it , as I'm sure there are many legitimate holder not mirco staking , with less than 1k . Any ways those ms have formed blocks with 1700-2000 you can check this using  presstab explorer. Even if u did target 1k below they will just readjustment buying a 30 day free period and they will be back at it

Is it possible to detect if a single wallet that has multiple address covering a spread of days , and force it to recombine into a single block , so that all matured coin will stake together and get combined into a single block , if they would like to split block on their own it would burn a tiny fraction of the coin , or make penalty for splitting block under a set of rules ,

Just thinking out loud . I may be wrong!!