With the 9mm and its small capacity, high pressures and it being a sensitive round, the check the charge every 5to 10 is good.
I prefer the HS6 as it is impossible to double charge it and it meters better (and I love B Eye but a tiny error and ungh)
I still use a single press and I inspect the cases for look of powder depth.
I had some a while back (rifle) that were not right. They had been measured, not sure what went wrong. Low not high so not likely to be an issue (at least with the powder I was using, some powders will cause issue if too little used).
Go slow and double check everything and auto powder charge needs to be very carefully checked.