I say if it is so obvious, keep buying each dip until it stops working.
it will be too late before you notice it stops working.....trust me....there is nothing thats going to say the dip buying is over, by that time the markets will have already corrected 10-20%
you could buy the dip, but instead of a 300-500 point dip it might be a 3000-5000 point dip
A dip is a dip