If you’re looking for autoflower plants to adhere to breeder estimates (say 85 days from seed to harvest) then by all means switch to bloom nutrients as soon as pistils appear. This will give you the best chance of reaching maturity within the breeder estimate.
Otherwise, auto’s mature at a similar rate as do photo’s once the flowering phase begins in earnest.
My feeding schedules for auto’s are specific to autopots (hydro) and rarely exceed half of that recommended on the bottle/packages. That’s more related to continuous feeding that is supplied by autopots. Otherwise, I think google will give you some decent results for comparative purposes as to what typical auto growers feed. @kw_Bat
Seeing now that you are using DWC (hydro) here is a couple sample ffeding schedules for auto’s. I have had very good results using Advanced Nurtients Ph Perfect Sensi Grow and Bllom products (despite the fact there were issues also). I have also used the modified lucas formula with auto’s and that is using general hydroponics three part nutes (only Lucas only uses the micro and bloom, no grow)