No matter how you over-think it, the exposure was a low risk one with respect to HIV
anyway. In any case, your symptoms
came on atypically late; ARS symptoms
begin 10-20 days after infection, not 4 weeks or more. That alone rules out ARS.
Anyway, it is not possible to have HIV with negative antibody tests, duo (antibody + p24 antigen), and DNA tests you have had. (There is no such thing as a rapid 4th generation test, by the way. It had to be third. But that doesn't change anything.