As to birth control and abortion, you are flat out 100% wrong, they have nothing whatsoever to do with eugenics. These exist because people don't want to disrupt their lives with the difficulty of raising a child. In 99.9% of cases the genetic fitness of that child is completely immaterial. Birth control was also not significant in Margaret Sanger's eugenics writing: she advocated sterilization, and her support of birth control distinguished her from other eugenicists since she thought "fit" mothers still had a right to limit the number of "fit" offspring.
Which leads to another point: you are misstating "positive eugenics." Positive eugenics is encourage "fit" people to have more kids, not to encourage everyone to "reproduce in the best way possible." Again it seems like you are being plain dishonest - which is especially frustrating because I don't think you're arguing for eugenics, you're just trying to win an argument on the internet, and that argument rests on a dumb word game which ignores reality.
Genetic testing actually is a bit more relevant, but there are sharp distinctions between "medically justifiable interventions" and "attempting to optimize your children," and even optimizing your children is not the same thing as eugenics. It is irresponsible and childish to use the same term without being careful.
The goal of enhancing individuals and the human species by engineering the genes related to some characteristics and traits is not to be confused with the barbarous projects of eugenics that planned the simple elimination of human beings considered as 'imperfect' on an ideological basis. However, it impinges upon the principle of respect for human dignity in several ways. It weakens the idea that the differences among human beings, regardless of the measure of their endowment, are exactly what the recognition of their equality presupposes and therefore protects. It introduces the risk of new forms of discrimination and stigmatization for those who cannot afford such enhancement or simply do not want to resort to it. The arguments that have been produced in favour of the so-called liberal eugenics do not trump the indication to apply the limit of medical reasons also in this case.