I suggest to extend time between rounds, because alot of internet "strange things" happend in Autochess. And often i see players rushes with their decisions due to a lack of time. Maybe additional 10-30 seconds would be enough.
And this is plus that fact that result of a match are known before preparation countdown ends (i experienced two times a result window before match was started and results after it was finishes are the same as i saw before).