present perfect / simple past sentence

[snickchap]

Hello,

What do you think about this sentence: Should it be in the present perfect or simple past?

1) Ever since he has become a doctor, he just came straight home and took care of his family.

Should I change the above sentence into one below? Are the sentences below correct grammaticaly?

a) Ever since he became a doctor, he has come straight home and taken care of his family.

b) Ever since he has become a doctor, he has come straight home and taken care of his family.

c) He has come straight home and taken care of his family ever since he became a doctor.

d) He became a doctor. Ever since, he has come straight home and taken care of his family.

[gio]

we use present perfect for something which has started in the past and its results are obvious till now. Therefore I'd say:
Ever since he became a doctor, he goes straight home and takes care of his family.
I hope it's right.

[Tdol]

a,c & d are OK. Becoming a doctor is finished, so should be in the past tense.