In your last send email step, did you mean to say "Send email 1a if NOT member of list Responders from Track 1"? The way that you outlined will only exclude those who clicked the email and not those who opened it.
I think running a second smartlist would work better for you. In the steps you outline, anyone who opens or clicks the email within the 4 day wait step will have missed the chance to be added to your list.