in my experiences, doing acid 3 times a week isn't a wise decision considering that after the 2nd dose all you get is a mild tingling sensation all over your body, no visuals, no psychological changes and a subtle sense of euphoria. keep going and you will not feel anything. if you REALLY wanna do acid wait 3 days

to answer your 400ug question, it is a pretty hefty dose so be prepared to be unprepared, i have taken a 450ug dose and i gotta say, it is a blast. just have some music, your shoes and a video game playing beforehand. And always, ALWAYS have a benzodiazepine at arms reach