I've shown with sources that theory and practice indicate that a single COC pill / day is common and adequate treatment for feminization.
And here are some actual instances of trans women from Aus that report they take a single COC / day:
There are many posts like this in various forums from Aus / Asia from trans women who are feminizing just fine on a single COC / day. If you'd only care to go look and find them, you'd easily find lots more. Your contention that trans women need a lot more EE is incorrect and unsupported.