Lol why are you retaking?!? Have you already applied with 20AA?Nice orgo and g chem! Your gpa is really good and a 20 isn't too bad (I'm a hypocrite because I'm retaking a 20 lol). My GPA is much worse than yours which is why I'm trying to compensate. None of your scores are too bad; you should probably apply to more (4 schools is very little lol) but I definitely think you have a shot!
Most dat retakers end up with similar scores according to a study. So retaking a 20 is not my reccomended move.
As to OP,apply to all the schools you want. You have the average for most schools and while some schools with 20+ avg dats are harder to get into, a 20 won't disqualify you since it's a holistic review.