@Phaedrux
I don't fully recall the exact values, but I did some math when doing a simultaneous (~150mm/s) X and Y move paired with extruder working and mesh bed leveling + sometimes Z hop it would pass 85KHz step rate (I am using duet wifi 2) and would get some stutters.
So I thought getting Z microstepping to as low as possible would be a good idea to help out with the reducing step commands since my mechanical resolution was so good anyways.
I would also love to double my X and Y microstepping rates too. Just not enough commands to keep up sadly!