I have been testing again later in the day, macros at that time in photo.
AT6000 -> 0.08%BAC
Keychain greenwon -> 0.04%BAC
I found on the Keychain greenwon if I blow after the countdown starts (starting at 8 instead of 10) and blow the very last of my breath (until almost feeling like passing out) and have my whole mouth covering the mouth piece I can manage a reading. But not always. Not sure it is worth it.
On the upside, it doesn’t make so much noise and it was quite cheap.